I can't delete or change an admin account
My regular account is admin (not the one I want to delete). However, somehow my throw away account has become admin and 1st user? It always pops up first when my computer restarts to log in. I read in threads that I have to create another admin account to delete one. Now I have three admin account with two I can't delete. It doesn't allow me to change admins to regular user in any admin account.
I'm logged in the original admin account and I can't delete either admin account, only the standard one.
MacBook Pro 13″, macOS 10.15