How do I use an american express gift card to pay for a runescape membership?

Okay, so I've got a 25 dollar AE gift card that I'd like to use to pay for my runescape membership. The thing is, I can only use it in the US while Jagex is a UK company. How can I pay for it that way if I don't want to give away my telephone number or home adress?

ok i hope i can help you because i had the same problem. So you go to any shop near you preferably wal mart or target and buy a runescape membership gift card. this gift card has a verification code on the back and all you do is type in the verification code when you are asked for it while applying to be a member and BAAM your a member on runescape. Members is so much fun and i hope you do what i just told you because thats what i did and i have been a member for the past 2 years on these gift cards.
YOU WONT BE ABLE TO THEY ALWAYS NEED THAT INFO FOR ANYTHING YOU BUY ON THE WEB. EITHER GIVE THEM THAT OR YOUR NOT PLAYIN RUNSCAPE MAN
If you don’t want to give away your homeaddress, use a mail box. Or your aunt’s. LOL.
go to your account management and sign up for membership and it should work

but this game is better and you dont have to pay membership

http://www.sssl.tk