Multiple usernames (on Forum) under same account?

Hello!
I had a question regarding the forum and characters being linked up. When I registered for the forum, it asked me to choose my main character, and gave me the option of the one I created (Iolair Silverwing) and the one my daughter created (Lea Moon).
My question is, is there a way she can have her own username on this board so she can check server status/participate in the forum under her own account? Or would she have to do it under mine?
We both play under my SquareEnix account, but have separate characters we created (see above)
Is this possible? Or does she need her own squareenix account? Would that mean she wouldn't be able to connect it with her already created character?