Name is used by another user

Yes, Frank is still an account you change the full name but the account name stays as Frank. Also you shouldn't name any accounts on your system as "Administrator" if you are the main user on your system then you need to be setup as a administrator. Change the name back to Frank. If you don't want to have administrator rights then you will need to make a new user as a administrator then go into your account and change it to a standard user.

Or more current: Lion 😉

@ Francois. Is this a good idea for a first time Mac user?

There's a good deal of debate among a part of the Apple community as to whether it is safe (or at least good practice) to use an admin account for daily work. At home I use an admin account - I'm the only person who touches my computer. For my notebook and work computers I use a standard account and use fast user switching to log into the admin account when I need admin access. Since there are many potential users and/or the environment isn't locked down (as my home is) I figure it is prudent to operate out of a standard account there.

If you go in System Preferences, under Users & Groups, simply right-click the (old) Frank account, and pick "Advanced Options". This is where you would attempt to completely change the names. Just be sure you have a full back up, before tinkering in there, just in case.

🙂

Ahh... well, should anybody be looking for me later this evening I'll be lurking at my desk, keeping busy with pretending not to notice the small gray cloud (of shame) that's not been following me around today, honest!

:$

Just to clarify it is a few more steps to take before a complete name change can be done. Take a look at this link, http://support.apple.com/kb/HT1428

Good to hear Frank!

@ François: That small cloud will be over all of our heads in a couple of days - iCloud! 😝