How do I change me edit name in Acrobat 8

Hi, it's me again.  I got the Adobe Acro 8 up and running well, but 

I'm trying to remove my name which is automatically added to any 

changes I make.  I followed the manual which says to go to Preferences 

and unclick Always Use Log-in name which I did but nothing changed.  I 

went to Identity in the same place and I can change my name but not my 

Login Name which is locked.

Any suggestions?

Best,

Joe