They asked you to insert a security code that is not your password and everytime you log in they ask you to insert that, otherwise you can't play cos you can't use your inventory, stash and so on.
If you forgot your security code you are doomed lmao
When first that window apears, you have to ditch it (means you must say refuse to input a code pushing no). If you by error and not knowing what it was and not knowing what button you pushed you activated it, then you are screwed cos will keep spawn everytime you log on game asking you to input the security code.
I always pushing No button, don't want a security code cos i never know when they ask you for a change or who knows what else.