The Image Line forums host the FL Studio, DeckaDance and EZGenerator tech support forums.
There is a difference between forum Handle / forum Nickname and your forum login.

Your forum login name you use to access our Image Line Forums is the same as the one you use to access your profile page.

Login to the forum using your ordering e-mail address as login and your personal chosen password. If you don't remember this password, use the password recovery link to reset your password: "Forgot your password?

The forum forum Handle / forum Nickname is the name that is shown when you post a message on one of the forums. Make sure to not use a login name as forum Handle / forum Nickname as the forum can be viewed by anyone.

Also check this Knowledge Base article: "Registration Details: Which login to use where?"