How do I edit my profile on the Mobile App?

You can edit your Profile picture, your Display name and your Bio via the Zapper app. 

To do so, you simply have to visit the wallet tab, and from there select the Settings icon (gear icon) and from the Settings menu select "Edit Profile"

From the Edit Profile menu you can click on your Profile Picture to select a new one from your mobile phone images & pictures as well as input a new Display Name and Bio. 

Note, this will update these information across all Farcaster clients, not only on Zapper.