Production Scheduler - How to define organizations?

Hello everybody,

I'm trying to run Production Scheduling (PS). At the moment I'm creating the production schedule in the Production Scheduler, which afterwards will be exported to PS.

However I'm having this warning when I try to create the production schedule (Path: Production Scheduler -> Names):

"No organizations defined."

Could you help me on this issue? Or indicate me which Manual contains this setup information? I've been researching but couldn't find anything useful.

Thank you so much.