I think you'll find the command documented for authenticating is /auth [code].
The link command is used only once, and only in online mode, to log an exisitng guid onto a forum user account. If you are using it in offline mode, it is at your own risk.
Comments
The link command is used only once, and only in online mode, to log an exisitng guid onto a forum user account. If you are using it in offline mode, it is at your own risk.