Welcome, saw your post r.e. your 2013. Congratulations, sounds like well equipped and reasonable price too.
Idle speed is adjusted via knob located on left side of float bowl; it is attached to a cable that runs under carb to a throttle stop on the right side. Knob twists by hand, crack throttle a bit to make it easier to turn. Clockwise to increase idle speed, counterclockwise to lower idle speed.