Triton LE mother board KLM2277

Hi everyone
First question here- hope someone can guide me to making a KLM2277 triton LE motherboard that came from a 61 key model work for a 76 key model. I know from Syntaurs site that it is a jumper I need to switch/change. Grateful if someone could guide me on what I need to do.

Cheers

Marked on the board - R1 or R2 in decides if 61 or 76 key respectively

image

image