The adjuster (#8) is in two parts. The star wheel section threads into the other section. You then screw it together to make it shorter or unscrew it to make it longer (and bring the shoes closer to the drum).
Every time I do it I have to picture the adjuster & how it is positioned to figure out which way to turn the star wheel. Worse case is you turn it a few clicks the wrong way but otherwise nothing bad is going to happen.
I just did this a few days ago. I can't remember but I know if you go the wrong way the start wheel will stop but the rotor will still turn. Just go the other way. I turned it quite a bit. I don't think they were every adjusted. It's obvious when you get close. I would turn a few and try to spin. Once it started getting snug I backed off a few clicks.
The hard part was finding the star wheel. I had to get a flashlight and spin the rotor around to know what I was looking at.
Here's a picture of what's inside the hub/drum. Note that the star wheel spokes are against the brake shoe return spring. This is what keeps it from turning until you push with a screwdriver via the access hole.