What happens next?

How to install couchsurfing app
Tap the app store icon from your home screen.
This will launch the app store on your ios device.
Search for the couchsurfing app.
Tap the " search " button at the bottom of the app store and you will be brought to the search page. Type " couchsurfing " at the top of the page where the text field is, and tap the couchsurfing icon once the search yields results.