Question about integrating the HomeWizard P1 energymeter

I followed the interesting appliccation written by Back2basic, (GitHub - back2basic/dbus-Home-Wizzard-Energy-P1: Integrate Home Wizzard Energy P1 meter into Victron Energies Venus OS). I have question about it but could not enter it on the github-site, it seems to be read only now. The question is were to put the script that back2basic provided. My guess is that it should be on the Cerbo itself. If so, is there an introduction how to program on the Cerbo?
Many thanks in advance.

https://communityarchive.victronenergy.com/questions/238117/home-wizzard-energy-p1-meter-in-venusos.html