Trying to add signature in the forum settings. I've triedto type my signature several times. I"ve clicked"OK", then tried again and clicked "APPLY"Signature is notshowing after I click OK or APPLY. At the top of the settings window I see a message saying "YOUR LOGIN OR E-MAIL HAS BEEN CHOOSEN, PLEASE TRY AGAIN".

Thanks
Cal</p>

It means your email on that account appears with another account in our system.  you must have signed up twice with two usernames at some point