what is my administrator name and password?

System Preferences -> Users & Groups

The entries with "Admin" under the name is the Admin accounts.

By default this is the first account you created on your Mac when you first set it up. Most people only have a single account and it is the one they use everyday.

If you do not know the password to the account with "Admin" under its name, then the link provided by

IdrisSeabright

should reset your password.

No one here would know what your user name and password are.

See if the information in this article helps:

Change or reset the password of a macOS user account - Apple Support