There's currently no manual for H9 Control yet, but we're hoping to get to that soon. There are a fair number of help videos though:
These videos explain for example how to change the expression pedal mapping for a preset. (That's what those two buttons above active and tap are for.) There's currently no videos for the hotswitch programming but that's easy to explain. To program the hotswitch in H9 Control, long press the hotswitch until it starts flashing; then its in programming mode. You can then move the knobs into the position you want them to be in when the hotswitch is pressed, and when you're done making your changes, press the hotswitch again to stop programming.