Deleting a user in WordPress MU is rather straightfoward. The steps to do this are below. Remember, you cannot undelete a user in the admin screen. You can only do that by restoring a database backup which you should not do under most normal circumstance.
- Login as an admin user
- Go to your Contol Panel
- Choose Site Admin
- Choose Users
- Delete 1 User
- Enter that user name into the search user box and click Search
- Once that user is displayed, click Delete on the right hand side of the screen for the user you want to delete.
- Delete multiple users
- Check the boxes beside the users you want to delete – As a reminder here do not hit next or move to another page. You can only delete users from the current list
- Select the Delete box below the user list
- Click the Apply Changes button



