Introduction: This article will cover how to delete a previously existing User.
Step 1: Press File and then Admin Dashboard.

Make sure that all other windows are closed before trying to open Admin dashboard.
Step 2: Press the Users & Groups button.

Step 3: Press the name of the User you would like to edit.

Step 4: Press the Edit User & Group Membership button.

Step 5: Edit the relevant information.

Double-click the group on the right that would you like the new User to be added to. Double-click the group on the left that you would like to disclude the User from.