The site header has a series of links on the top-right that are managed via two different Link Lists (managed under Content > Link Lists).
Help Article: Editing Link Lists
1. Header Top Links
This area is reserved for a few important items and is managed with a Link List called, Header - Top Links. Each item in the list is made-up of two pieces: a name and a link to a page on your site.
2. Social Media Icons
If your church is active on social media, you'll want to make sure to use the Social Media Link List. Each Link List item consists of a name, a link to your social media page, and a special "icon class."
List of available icons and their names: http://mk033.monkpreview.com/_assets/fonts/icons/