Power Pack 2 Question

I recently had to perform Crankshaft relearn process using PROCAL software. I don't recall exactly but there was a setting for Octane calibration setting. I know that 91+ octane is required after installing Power Pack 2, but is there anything I need to do? Or do I just start filling up the tank with 91 octane gas?

No need to do anything. You can set it to 'on' which will allow the timing to be adjusted if any detonation is detected. Otherwise just fill 91+ and you're good to go.