good morning, as in the picture a pretty simple setup for a Genoa control.
the green line is the loop, it rolls on and off at the same time moving the line towards one side and the other.
the red line is the control to extend the sheet from the sail. in order to sail tight to the wind or for the wind.
on the green sheet there is a ring fixed. all the way extended to one side it is on the end point. When the green line moved to the other side it is on the end point on the other side.
through the ring the red line can move tight or wide.
for the dragon as this is a smaller boat, check out YouTube Genoa on Micro Magic. You will see easy options also !