1. on the login/signup screen you can hide the camera scan/share icons
2. for international users you should eliminate the zip code. maybe using country or other method to locate the user
3. in the manage book status you ask for location for shipping origin if selling. but maybe the location should be set in the profile once so the pp should take it from there for each book, for selling and borrowing. also, marking as favourite, lending and selling the book options should not eliminate each other. if you press favourite, you cant press lending, if you press lending you cant sell it...