Upon completing my Gitea installation there is a user but I’m unable to log into this user as I don’t know the users username and password; as well, I’m unable to create a new administrator user so that I can configure gitea ?
Personally I would just re-install gitea and re-create the administrator account with a known password.
If this does not work, then don’t create the admin account during setup, and register your account after installation - the first account registered is admin.