Hi Lynn,
First, go to Edit-Preferences-General, and in the Commenting section Uncheck the option for "Always Use Login Name for Author Name." Now open the PDF and make a comment or text edit. Double click on the edit and click on the Options pulldown and select Properties. In the Properties dialog under the General tab enter the author you want shown PLUS click on the" Make Properties Default" checkbox before closing that dialog. Now that author's name will be shown for all comments/edits. To change it back, just go to the Properties dialog and change it there or you can go to Edit-Preferences-General, and in the Commenting section Re-check the option for "Always Use Login Name for Author Name" which will overide any settings in the comment dialog.
Hope this helps,
Dimitri
WindJack Solutions
www.pdfscripting.com
www.windjack.com