Upfront: Adding a Twitter/Facebook/RSS/iTunes Icons

When I started the website, I took off the social icons because I didn't know what I was planning for Twitter/Facebook/RSS/iTunes. Now I want to add them back, but can't figure out how. I went to the "test upfront" page and found this code:

<ul class="socials">
  <li><a class="social-icon youtube" href="http://youtube.com"></a></li>
  <li><a class="social-icon facebook" href="http://facebook.com"></a></li>
  <li><a class="social-icon twitter" href="http://twitter.com"></a></li>

Back at my website, I choose "Code" and enter this in. All it shows are bullet list dots - not the social network icons. I went back to the upfront test page and tried the same thing with the same result.

How do I get back the social icons?