Aux routing for monitors?

Asked the guy who setup my system the question below. He sent me the attached cheat sheet on my setup. I thought I could figure it out, but turns out I’m only a fader jockey lol. Any detailed help?

How do I assign a unused aux (preferably aux-3) to a floor box output Channel number 5? Channel 5 & 6 is currently being sent a signal from aux-2

I would like to keep aux-2 sent to floor box output ch6

I would like to send aux – 3 to floor box output ch5

Aux 2 is conned to in ear monitors, and the aux 3 Channel needs to be used for situational(temporary) physical monitors.