It looks like you might be missing some fittings. The end of your boom is just the end of a hollow tube. Usually there is an end fitting there, but you do have a couple of straps, one on top at the end and one on the stbd side near the end, plus a cheek block on the stbd side of the boom. There doesn't seem to be anything at the tack end of the boom to secure the tack grommet for reefing. You can either look for a suitable fitting or make something that works for the purpose.
Your sail has grommets for the tack and the clew, which are reinforced. The 2 grommets in the field of the sail are not reinforced and used only for gathering up the loose sail with small line. You have just one set of reef points.
So, without adding fittings to your boom, you can reef basically with a 2-line system. The clew end would be tied down at the clew with a line that is secured to the strap at the end of the boom, passing through the clew grommet, then down around the cheek block and secured forward on the boom at a cleat. The tack end would be secured with a line that passes through the tack grommet and is secured to itself under the boom somehow to hold the tack end down. You could probably make a line that has the correct length, that you pass through the tack permanently, so that it is ready to be secured with clasps under the boom anytime you want to reef.
You don't want to release the reef at anytime while you have those interior grommets secured to the boom with a line to gather up the sail. That is one way of tearing the sail.
In fact, I never bother to gather the sail when I am at the 1st reef. I just let the excess sail hang loose. It's not in the way and it is doing no harm, so it is not worth the effort if I'm out for a day sail. I don't even gather up the sail for the 2nd reef point, but with that amount of loose sail it is looking very sloppy. But I don't have a 2nd reef in very often so I don't bother then either.
