If you go to your home page on FamilySearch and oen up your name in the upper right corner:
After opening up your name you will see "settings", click on settings and uder the tab for contact you can change your profile name:
Further to what 'Steve' has already provided ...
It IS the (ie. your) "Contact Name" that you will need to "Change".
That "Contact Name" is that (ie. the SAME) that appears (ie. is displayed) for You in, "Family Tree"; and/or, this "Community.FamilySearch" Forum (plus, the various 'Groups'); and/or, the 'FamilySearch' ("GetSatisfaction") 'Feedback' Forum; and/or, just about everywhere else in 'FamilySearch'.
I hope this helps.
My Familysearch name is nanlwar, but as you can see on Community Groups I am nancilwarner1. Would like to have it all say nanlwar. Is that possible? Can youo do it for me?
Brett, Thank you. I finally found Contact and the place to change that name. It worked! Thanks again.