How do I give someone a new username (and system email address)?

Strictly speaking, you can't change someone's username. You can, however, remove someone's user access and then immediately re-add them as a user with a new username. You'll follow this same process if you need to change someone's system email address. For more details about usernames, you'll want a look at this article.

1. Click Active User.
2. Select Is not a user from the status drop-down.
3. Click Save.
4. Again, cick Active User.
5. Select Is a user from the status drop-down.
6. Give her the new username.
7. Choose an alternate email to which Populi should send the Welcome email.
8. Click Save.

A few notes

• Is your school using Google Apps for Education (or whatever it's called this week ^*) with Populi? Removing user access will disassociate this person's account from any corresponding account in your Google Apps setup. Neither their email, nor their account, will be deleted.
• This article describes how to free up a deleted/inactive username for re-use by a new user account.

^* As of this writing, seems to be called Google Workspace for Education Fundamentals...