To delete a user from your Google Apps domain:

  1. 1. Sign in to the Google Apps administrator control panel.
    The URL is https://mail.domain.com, where domain.com is the domain name you used to sign up for Google Apps.
  2. Click the Organization & Users tab.
  3. Check the box next to the user (or users) you want to delete.
  4. Click More actions > Delete users
  5. When prompted, confirm that you want to delete the user
  6. If necessary, delete the user from your Gmail contacts list.

Remember that it takes up to five days for a user to be deleted so make sure to delete any unnecessary accounts before your Google Apps Premier free 30 day trial ends.