It's just as easy to teach them to go to Tools->Security->User And Group Accounts as it is to add a button. Seriously.
Write down a step-by-step process for adding users, then give that 'manual' to your boss. They're going to be calling you anyway, even if you make a button, if you don't fully explain how to add users/set permissions.
Oh, and you can pop up either of the security dialogs via code, by:
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