Why I am not able to change my name?
An administrator may change/decide you name within an adult group. This name will be displayed in that particular group and within the invitations that are sent out from that group. The administrator is given this option in order to easily organize the group, and to not be confused (for example) by members that use funny names that the administrator may not recognize.
You need to contact the group administrator if you want another name to be displayed.