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.

Possible answers:
[I] Tap on the magnifying glass icon at the upper right corner of the app store screen to start the search. Type in " couchsurfing " on the results to confirm the search.;
[II] Type keywords in the search field provided, or tap the search field to begin. Tap the app's name to start the search.;
[III] Tap the search field on the top toolbar and tap the magnifying glass icon beside the search field. Type " couchsurfing " and tap on the search result.;
[IV] 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.;
[IV]