How to edit performances?

Hi
I'm very happy that we have now the performance section in RM.
However, I do not find, how I can edit them?!
Am I just a little bit too stupid out is this not possible?
I thought I heard it is now possible to edit them? E.g. changing rigs of add rigs in one performance or create new ones?

Yes, sorry..
I recently managed to.
At least I can make new performances and edit them, if I click on the right location.
Not very intuitive, but fine for me!