Zorro is not open source. Some functions are open source. The ones that are have a check mark in this list are open source and zipped up in the source folder:
https://zorro-trader.com/manual/en/funclist.htmYou are responsible for calling series() and indicator functions on the script side. Zorro iteratively calls the run() function, which is where you place your indicator function calls.
The free tutorial with the free Zorro software starts here. It's well worth your time, as it will answer most of your questions:
https://zorro-project.com/manual/en/tutorial_var.htm
