tying your line(s) to the eye(s) on the port side of your boom.
Aft = first reef; Forward = second reef.
These lines will go up to the grommet(s) in your mainsail: Aft
goes through the first grommet (looking up). Forward goes through
the second grommet (looking up).
Finally, not reefing related, there is a cleat forward of the
reefing eye(s). This is the out-haul. Line should be tied to
the sail clew; go through the block on top of the boom (attached
to the same eye as you would attach the topping lift); forward
to the before mentioned port cleat.
Starboard side: Pass the first reef line through the aft block;
Feed the second reef line through the forward block.
end of the reef line goes through the forward cleat(s) on the
starboard side of your boom. Again, the first reef goes into
the aft cleat and the second reef goes into the forward cleat.