<% content_for :title, "Administrator" %>
<div class="row">
    <div class="columns small-12 medium-6 large-4">
    <ul class="side-nav">
      <li class="heading"><%= fa_icon 'cog'%> General</li>
      <li><%= link_to 'Defaults', admin_configurable_path %></li>
      <li><a href="#">Mass mail</a></li>
    </ul>
    </div>
    <div class="columns small-12 medium-6 large-4">
    <ul class="side-nav">
      <li class="heading"><%= fa_icon 'users'%> User related</li>
      <li><a href="#">List users</a></li>
      <li><a href="#">Add user</a></li>
    </ul>
    </div>
    <div class="columns small-12 large-4">
    <ul class="side-nav">
      <li class="heading"><%= fa_icon 'folder'%> Group related</li>
      <li><%= link_to 'List groups', admin_groups_path %></li>
      <li><a href="#">Add group</a></li>
    </ul>
    </div>
</div>

<% content_for :title, "Administrator" %>
<div class="row">
    <div class="columns small-12 medium-6 large-4">
    <ul class="side-nav">
      <li class="heading"><%= fa_icon 'cog'%> General</li>
      <li><%= link_to 'Defaults', admin_configurable_path %></li>
      <li><a href="#">Mass mail</a></li>
    </ul>
    </div>
    <div class="columns small-12 medium-6 large-4">
    <ul class="side-nav">
      <li class="heading"><%= fa_icon 'users'%> User related</li>
      <li><a href="#">List users</a></li>
      <li><a href="#">Add user</a></li>
    </ul>
    </div>
    <div class="columns small-12 large-4">
    <ul class="side-nav">
      <li class="heading"><%= fa_icon 'folder'%> Group related</li>
      <li><%= link_to 'List groups', admin_groups_path %></li>
      <li><%= link_to 'Add group', new_admin_group_path %></li>
    </ul>
    </div>
</div>

Correct link for new group
Correct link for new group
