I input my Rockstar energy drink codes into their website and it's linked to my account, do I need another code some how??

up

when you put your code in on the website go to your account and it should show the things you get and should say get code or w/e
click that and it'll give you your xbox/pc code and you redeem it

can others redeem it if i wanted to give away

if it's the actual code to redeem i'm sure you could