Responsive Web Design Projects - Build a Product Landing Page

[General]

Tell us what’s happening: I am having difficulty figuring out the User Stories #13 and #15.
Can anyone offer assistance please

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Challenge: Responsive Web Design Projects - Build a Product Landing Page

Link to the challenge:

freeCodeCamp.org

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[General]

<header { position: "fixed"; top: "0";}

Features How It Works

        <a class="nav-link" href="#pricing">Pricing</a></li>
      </ul>
    </nav>
  </header>

  <div class="container"></div>

  <section id="hero">
    <h2>Handcrafted, home-made masterpieces</h2>
    <form id="form" action="https://www.freecodecamp.com/email-submit">
      <input
        name="email"
        id="email"
        type="email"
        placeholder="Enter your email address"
        required
      /><br>
      <input id="submit" type="submit" value="Get Started" class="btn" />
    </form>
  </section>

  <div class="container">
    <section id="features">
      <div class="grid">
        <div class="icon"><i class="fa fa-3x fa-fire"></i></div>
        <div class="desc">
          <h2>Premium Materials</h2>
          <p>
            Our trombones use the shiniest brass which is sourced locally.
            This will increase the longevity of your purchase.
          </p>
        </div>
      </div>
      <div class="grid">
        <div class="icon"><i class="fa fa-3x fa-truck"></i></div>
        <div class="desc">
          <h2>Fast Shipping</h2>
          <p>
            We make sure you recieve your trombone as soon as we have
            finished making it. We also provide free returns if you are not
            satisfied.
          </p>
        </div>
      </div>
      <div class="grid">
        <div class="icon">
          <i class="fa fa-3x fa-battery-full" aria-hidden="true"></i>
        </div>
        <div class="desc">
          <h2>Quality Assurance</h2>
          <p>
            For every purchase you make, we will ensure there are no damages
            or faults and we will check and test the pitch of your
            instrument.
          </p>
        </div>
      </div>
    </section>
    <section id="how-it-works">
      <iframe
        id="video"
        height="315"
        src="https://www.youtube-nocookie.com/embed/y8Yv4pnO7qc?rel=0&amp;controls=0&amp;showinfo=0"
        frameborder="0"
        allowfullscreen
      ></iframe>
    </section>
    <section id="pricing">
      <div class="product" id="tenor">
        <div class="level">Tenor Trombone</div>
        <h2>$600</h2>
        <ol>
          <li>Lorem ipsum.</li>
          <li>Lorem ipsum.</li>
          <li>Lorem ipsum dolor.</li>
          <li>Lorem ipsum.</li>
        </ol>
        <button class="btn">Select</button>
      </div>
      <div class="product" id="bass">
        <div class="level">Bass Trombone</div>
        <h2>$900</h2>
        <ol>
          <li>Lorem ipsum.</li>
          <li>Lorem ipsum.</li>
          <li>Lorem ipsum dolor.</li>
          <li>Lorem ipsum.</li>
        </ol>
        <button class="btn">Select</button>
      </div>
      <div class="product" id="valve">
        <div class="level">Valve Trombone</div>
        <h2>$1200</h2>
        <ol>
          <li>Plays similar to a Trumpet</li>
          <li>Great for Jazz Bands</li>
          <li>Lorem ipsum dolor.</li>
          <li>Lorem ipsum.</li>
        </ol>
        <button class="btn">Select</button>
      </div>
    </section>
    <footer>
      <ul>
        <li><a href="#">Privacy</a></li>
        <li><a href="#">Terms</a></li>
        <li><a href="#">Contact</a></li>
      </ul>
      <span>Copyright 2016, Original Trombones</span>
    </footer>
  </div>
</div>