NOTE: If you change a user's username and don't tell them, they can't log in. Sending a seamail
informing them of their new username is ineffective as they can't read it.
If the user's standing next to you at the Help Desk, you can use this form to change the user's username.
If the user's name is sorta offensive, it may be best to quarantine them and send them a seamail saying they
need to change their username to get un-quarantined.
If the user's name is really offensive to where they get banned, you can use this form to change their name
which will update all their posts with their new (non-offensive) name.