Let me see. You had a profile and you used to log in with FB - now you have a profile with your Adobe ID so basically you have two profile. What I would do is logging in with your former account and change the email associated with the Adobe ID. Sounds like the easiest solution.
Follow the steps here
Good luck and let us know if this work!
Hello - Flora is exactly right! If you're still having trouble gaining access to your original account, please get in touch with our support team at http://on.be.net/GetHelp and someone will help out right away.
And by the way, if formerly you had a button "log in with your Facebook" that now is gone, just sign in with the email address and password you use for FB and Behance should recognise your older profile. Then you go to the settings and do the change as it is shown in the link I gave you.