Username problems

For both my sites I purchased using the enfold theme my user name seems to be stuck to my email address. I tried to go and change it in enfold and it says”Usernames cannot be changed.” But i definitely didn’t choose my email as my username. Does it have to do with word press or my hosting provider possibly? In any case I need to change it because I have made a forum for my website and can not have my private email address displayed to the public as my user name.

Regards,
Joshua