iPrint Appliance User Login

We are on iPrint appliance version 4.2.6 and I would like to add 2 users to be able to access the appliance (:9443).  Currently only root and vaadmin can log into the appliance.  Is there a way to do this?  I know with ZENworks you can add users to the vaadmin group to access the appliance but there is not a vaadmin users group on the iPrint appliance.