If set up two new ways to sign in to the forums. You can now use Google and Steam accounts to sign in. We still have the Twitter and Facebook linked logins available as well.
To prevent them from trying to set up a new forum account when you try to use them, please login with your Forums account first and go to Edit my Profile. You will find two new options on the sidebar called Manage Google and Manage Steam. Use these to associate your accounts first. Then you will be able to use these in the future.