How to nest fieldset in this code?

Tell us what’s happening:
Describe your issue in detail here.

  **Your code so far**

<html>
<body>
  <h1>CatPhotoApp</h1>
  <main>
    <section>
      <h2>Cat Photos</h2>
      <!-- TODO: Add link to cat photos -->
      <p>Click here to view more <a target="_blank" href="https://freecatphotoapp.com">cat photos</a>.</p>
      <a href="https://freecatphotoapp.com"><img src="https://cdn.freecodecamp.org/curriculum/cat-photo-app/relaxing-cat.jpg" alt="A cute orange cat lying on its back."></a>
    </section>
    <section>
      <h2>Cat Lists</h2>
      <h3>Things cats love:</h3>
      <ul>
        <li>cat nip</li>
        <li>laser pointers</li>
        <li>lasagna</li>
      </ul>
      <figure>
        <img src="https://cdn.freecodecamp.org/curriculum/cat-photo-app/lasagna.jpg" alt="A slice of lasagna on a plate.">
        <figcaption>Cats <em>love</em> lasagna.</figcaption>  
      </figure>
      <h3>Top 3 things cats hate:</h3>
      <ol>
        <li>flea treatment</li>
        <li>thunder</li>
        <li>other cats</li>
      </ol>
      <figure>
        <img src="https://cdn.freecodecamp.org/curriculum/cat-photo-app/cats.jpg" alt="Five cats looking around a field.">
        <figcaption>Cats <strong>hate</strong> other cats.</figcaption>  
      </figure>
    </section>
    <section>
      <h2>Cat Form</h2>
      <form action="https://freecatphotoapp.com/submit-cat-photo">
       <fieldset>
          <legend>Is your cat an indoor or outdoor cat?</legend>
          <label>
            <fieldset>
              <input id="indoor" type="radio" name="indoor-outdoor" value="indoor"> Indoor
              </fieldset>
              </label>
          <label><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor
           </label>
            </fieldset>
        <input type="text" name="catphotourl" placeholder="cat photo URL" required>
        <button type="submit">Submit</button>
        
      </form>
    </section>
  </main>
</body>
</html>
  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.36

Challenge: Step 51

Link to the challenge:

still showing " Both fieldset elements should be above the text field and its associated label element. They are out of order."

As mentioned by @vd.saurab earlier, you should delete the <fieldset> </fieldset> tags I mentioned above since it is inside of another fieldset. The instructions said to add a new fieldset below the existing one, not nest/insert one inside.

See the </fieldset>? That is where you should create your new fieldset, either beside or below it. Hope that helps…