Hi chood and welcome to the support forums.
I can certainly help with your users. This link will show you how to manager your users: https://business.comcast.com/help-and-support/accounts-billing/add-delete-comcast-business-user. Please let me know if you need any assistance.
Thats not the same thing that I'm looking for. We never set up users under "My Account". I'm just talking about phone users in the voice edge portal. We have several ex-employees that nee removed.