How can I buy Xbox Live Gold on my Xbox?

My another question is that, How to recognize the xbox live silver card and xbox live gold cards? Is the silver card still available.

Can i use xbox gift card to buy a gold membership?

Last I remember, there's always a tile somewhere on your main menu to sign up for Xbox Live Gold, if your account is currently "Free" status. Often it would say something like "GOLD", "Connect to Xbox Live", or something similar.

You can also sign up for it here: http://www.xbox.com/en-US/live/gold

You can ALSO buy prepaid cards (found in increments of 1, 3, 6, or 12 months), if you prefer to not use recurring payments with a credit card. The card would have a scratch-off code, and you enter the code here:
https://redeem.microsoft.com

My ask is almost this.

My xbox are arriving to me on this week and I'm with a question.

I'll buy the live gold for play games online and also to buy digital games.

my questions...

my gf will use my xbox with me, on their own profile. their will have access on the games that I buy ?

and, they can play online using their profile but my live gold ?

its like, the live gold is for the xbox console (and all profiles) or is for each profile, then my gf need to buy gold also ?

thanks

gggffgbfgvgfbgffrgrftrgtfgtrrrgtftftgfttt4t5rt4t4r

hey , i buy before 2 month a 1 month long xbox live gold and inprevious month has the xbox buying a nother and i dont that,so i want to remove my card but i dont know how can i do that

Ok I'll buy the xbox live gold then...but can my 2 other siblings use the same xbox live or we have to buy individually?

Thank you everyone.