To edit another admin's profile, you need to be the SuperAdmin. To be SuperAdmin, you need to edit this line in config.asp:
Const intAdminMemberID = 5
The number in red should be replaced by your member id. You can determine your member id by having a look at your own profile, from members.asp. The id is the last number shown in the URL.
After doing this, you will be able to edit the other admin's profile.