If the same username hasn't been used here (or there) before then you can register here & there under the same username & password.

To find out, press the Members List button above to see if your desired username has been used on these forums before. Contact an administrator like myself if you require name changing. Press on my username & select send personal message to ...

The same will apply to the LW beta forums. Except I'm only a mod there & not an admin. But communication may work well!