Manage Sites Features Page Explained

You can select the types of features to use on your site from the "Manage Content" > "Features".

Select the site from the "Select for a site to manage" drop down menu, click "Manage".

Check the box next to the features you want to include in the site.  The selected features will appear at the top navigation of the site. You can drag and drop the features to rearrange the order.

Click "Save" to save the changes.