For changing Hostname

Go to settings then system, go down to about and click Rename this PC (WKS01-Tanner)

For adding a new Admin account

Search lusrmgr.msc in the windows search bar Right click users and Select new User Enter in username and full name as (tanner.weinacker-loc) From there press create and you will be prometed for select groups Enter in (WKS01-Tanner\Administrators)