Popovers, what to do with them

I can open the popover dialogs, but I don’t know what to do with them.
Is there a list of input commands? ( Like, hoe do I produce a double bar line with a by Popover?)

Hello,
there is a zipped pdf-file available. Just look here:
https://www.steinberg.net/forums/viewtopic.php?f=246&t=107083&p=587433&hilit=dorico+popovers+zip#p587433