Melaine9, you can call me Julie. When I first joined the forum many moons ago, before we opened the business that s what I registered under.
I just point out to everyone that while you can not change the username you log in with you can change the name that is displayed on your post and Profile. In fact I think it is a good thing not to have your username showing.

Just go to your profile and click on "Account Related Settings". You'll see the spot for Name where you can change it.