you need to sign up on it with the same email and password like on this website.
This, plus if you're already signed in on this site, doesn't that mean you only have to click sign-in on the Bungie site and you'll log in without needing to re-enter details? I know I don't have to after being on here anyway since it all uses Microsofts
login framework thing.
If you are making a new Bungie account but want to attach it to an existing Windows Live ID, then you need to be signed into the Windows Live ID that you want to link to the Bungie account before hand, and then click the box that says " Sign Up " not "
Sign In "