Um, it's been ages since I used a bow.
I'm a righty
When I knock the arrow, I hold the bow horizontal with my left hand palm down. This lets the arrow rest on the bow and my finger as I raise the bow to verticle; it places the arrow on my left knuckle.
Not sure i it's rightl I was taught that in Hunter Safety many moons ago.
And this argument has happened before. I'l lay 5:1 that the left knuckle is correct