With the stock in place on the circle cutting jig, adjust the blade guard downward until it is just above the stock being cut. After checking the blocks and making any adjustments to the band saw, turn on the motor and wait for the blade to reach full speed. Then ease the stock through the blade, around the pin, until the entire circular shape has been cut. Be sure to hold the stock flat on the table as it turns.
When the cut is complete, turn off the band saw before removing any cutoffs. Then lift the stock off of the pin. If no other cuts are needed, remove the 4d nail from the jig before disassembling the unit.
You should now have a nearly perfectly circular cut piece of stock. Sand the curved cuts and use in your woodworking project as desired.