Ready to check in? There are two ways you can do that! 

Tap the map pin on the top right corner of the app (it appears at the top of every screen).

-OR-

Tap the blue box that sometimes appears at the top of your friends tab for a faster check-in: ‘Looks like you’re near Housing Works Bookstore Cafe: Tap here to check in.’ Double tap the blue box to skip the compose screen.