How to Register/Make An Account?
You Can't Register An Account, However, You Can Make An Account By Logging In With Steam. The Reason Behind This Is Security For The Website, To Keep Bots Off 501st Legion Website. Clicking On The Steam Button Will Redirect You To Steam, That Will Display A Warning That 501st Legion Website Is Not Affiliated With Steam. This Is Normal, Continue To Login To 501st Legion With You're Steam Account.
If You Did, But Steam Doesn't Redirect You Back to 501st Legion Website, Retry The Login Steps (Go to 501st Legion Website, Hit The Steam Button, And Login Again).