Let's keep in mind that there is no such thing as "Pi-Star network".
Pi-Star is a stand-alone software package, including the OS, that runs on the Raspberry Pi.
And just like pretty much any computer OS, if you forgot your login credentials there's no way simply bypass or reset the password.
So in that regard Pi-Star is no different from other operating systems.
In other words, Pi-Star is not a "user account" or a network login that could be reset by the Admin.
You are the "Admin" for that computer, and if you forgot your password you're just SOL.
AB6RF