Darkrp physgun and GUI question?

How do i make it were players(non-admins) can pick up there printers entities that they buy ,with the physgun?

How do I change the tabs that are in the gui menu. Like I want to rename the enitites tab to shipments and I want to make a new tab called printers and have all the printers in that tab?
And I want to remove the jobs tab as well cause i have no jobs on my server.

Whats the file called that has these settings?