how do i put in my credit card info onto my PSN master account

how do i put in my credit card info onto my PSN master account? my brother took back his ps3 and i got my own now. i used the "use exsisting account" option to get my PSN ID and stuff back. im now 18 but it didnt say wether or not i have the master account. im assuming so given im the only user on the ps3. how do i put in my credit card info so that i can buy things off of the PSN store? Video & Online Games - 3 Answers Random Answers, Critics, Comments, Opinions : 1 You go to your account management and look for the billing info. In there you should be able to add a credit card or change credit card info 2 you just need to go click on the PlayStation Store and buy something it will ask for your info then just type it in if that doesn't work tell your bro to go to account management and erase your billing information and credit card info and type it in on your ps3 3 i dont know