title: Enable Wordpress Plugin for a Custom Theme
body: <p>I made a theme from scratch and I understand that you need to call a function to enable plugins. Right now, I want to add share buttons after every post and also in my sidebar. </p>
  
  <p>I downloaded the plugin from here: <a href="https://wordpress.org/plugins/ultimate-social-media-icons/" rel="nofollow">https://wordpress.org/plugins/ultimate-social-media-icons/</a></p>
  
  <p>Obviously, it's not showing up when I activate it. What do I have to do to enable it on my custom theme?</p>