ID Deletion

I made the mistake of signing into about 12 new units with my user id that dell distributed via digital download. All of a sudden last week issues started popping for the people to sign in. They have been using all along. It is an issue with my user id now also of too many sign in. How do I delete my user id and install another? I did not get any of the serial numbers during the downloads for Dell. Support advised me on the serials I have but not to identify and change on each unit. Thank you in advance.