You have a custom page template (in Content > Pages) called Splash Layout, where you can set up your splash page. This layout should only be used once. 

The content throughout your splash page is set up in a few different places in the CMS.

You can update the logo at the top of the page in the link list (Content > Link Lists) "Splash - Logo".

The text at the top of the page is set up in the page's Content field.

The information for each campus pulls from People > Branches. There's one entry for each campus, where you can control:

• Name field populates the name of the campus on the button
• Website field populates the link the button links out to
• Description field populates the campus video 

The church information and social links at the bottom of the page pull from the same place your website's footer does - more info HERE