What should i do after this

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<h2>CatPhotoApp</h2>
<main>
  <a href="#contacts-header">Contacts</a>
...
<h2 id="contacts-header">Contacts</h2>
  <a href="http://freecatphotoapp.com" target="_blank">cat photos</a>
  
  <img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
  
  <p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff. Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched. Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>
  <p>Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched. Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff. Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.</p>
  <p>Meowwww loved it, hated it, loved it, hated it yet spill litter box, scratch at owner, destroy all furniture, especially couch or lay on arms while you're using the keyboard. Missing until dinner time toy mouse squeak roll over. With tail in the air lounge in doorway. Man running from cops stops to pet cats, goes to jail.</p>
  <p>Intently stare at the same spot poop in the plant pot but kitten is playing with dead mouse. Get video posted to internet for chasing red dot leave fur on owners clothes meow to be let out and mesmerizing birds leave fur on owners clothes or favor packaging over toy so purr for no reason. Meow to be let out play time intently sniff hand run outside as soon as door open yet destroy couch.</p>
  
</main>
  
<footer>Copyright Cat Photo App</footer>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements

<h2>CatPhotoApp</h2>
<main>
  
  <a href="http://freecatphotoapp.com" target="_blank">cat photos</a>
  
  <img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back.">
  
  <p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff. Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched. Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>
  <p>Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched. Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff. Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.</p>
  <p>Meowwww loved it, hated it, loved it, hated it yet spill litter box, scratch at owner, destroy all furniture, especially couch or lay on arms while you're using the keyboard. Missing until dinner time toy mouse squeak roll over. With tail in the air lounge in doorway. Man running from cops stops to pet cats, goes to jail.</p>
  <p>Intently stare at the same spot poop in the plant pot but kitten is playing with dead mouse. Get video posted to internet for chasing red dot leave fur on owners clothes meow to be let out and mesmerizing birds leave fur on owners clothes or favor packaging over toy so purr for no reason. Meow to be let out play time intently sniff hand run outside as soon as door open yet destroy couch.</p>
  
</main>
  
<footer>Copyright Cat Photo App</footer>

You need not add a new anchor tag, you have to modify the above mentioned anchor tag,

Delete the target=“_blank” attribute

Change your external link to an internal link by changing the href attribute to “#footer”,
It means change href=“” value to #footer

Now you have this,

Then add an id attribute with a value of “footer” to the <footer> element at the bottom of the page.

https://learn.freecodecamp.org/responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements/ after this what should i do give an example

You have to provide the code you have tried, this link will only take to the challenge

Before that let me clear it to you,

You should have only one anchor tag <a href=""></a> and
Instruction: The a tag should have an href attribute set to “#footer”.

And one footer tag at the bottom, footer tag will be like the main tag you have created, but you have to place it at the bottom
Instruction: The footer tag should have an id attribute set to “footer”.

After you try this, post your code, i’ll guide you

i have deleted what u have asked me to after that i didn’t understand anything .
i need a example or sample

Okay here is an example,
<a href=""></a> // This is your anchor tag
<footer></footer> // You have this footer at the bottom below </main>

You have to create an id to your footer tag, it means <footer id="">
Now follow this instruction,

The a tag should have an href attribute set to “#footer” // place this value inside the href

The footer tag should have an id attribute set to “footer”. // place this value inside footer id

This link will show how to create class and id with an example

This will teach you about anchor tags,

<a href="http://freecatphotoapp.com" target="_blank">cat photos</a>
Change the href attribute to the id of footer like #abc

<footer>Copyright Cat Photo App</footer>
This tag must have an id which is being referenced by anchor like <footer id='abc'>