I'm really getting fed up

This isn’t the url given in the instructions:

Now set the src attribute so that it points to the url https://cdn.freecodecamp.org/curriculum/cat-photo-app/relaxing-cat.jpg


I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (').