ok so up unitl not i have just been downloading free apps. today i went to buy on and it asked me to sign in to a gmail account, fair enough, so i signed in with the account that is on my phone (email@example.com, my university uses gmail accounts). after i signed in it asked me if i wanted to sync a bunch of stuff, i unchecked every box, then hit sync. after it had finished that it went right back to market page with the app i wanted to buy. so i hit buy and it asked me to sign in again! it just keeps asking me to sign in, did i miss something? where do i put a credit card in?