Click Remove user to remove the currently selected user(s) from the list. You should only use this action if you are absolutely sure that you want to remove the user from the DME system. Even though you can easily recreate the user, all statistical information about usage, devices, and so on will no longer be associated with the user that you recreate.
DME will ask you to confirm the removal:
Note that a user with Administrator role (see About roles) cannot delete his own user. Another administrator must do that. This is to prevent a situation where a DME system is left with no administrator users.