It is kind of like a braid. But dirty looking. Instead of using 3-4 sections. You use 2.
Now, take a section of hair. If you want thicker locks, 1 inch sections are usually the biggest you want to go. That'll give you about 40 locks. If you want more, make them smaller.
With that section of hair in your hand, split it into 2 parts. They shouldn't be even (Even parts is what makes them look more braided). Pull those sections away from each other. Then make 2 new sections. Pull those away from each other. Then 2 new ones. And again pull them away from each other. You want to do this until you are at the tip of the new lock. Each lock can take some time. So be patient. Even if they look a bit braided at first, as they mature, that appearance will go away and you will not be able to tell.
You don't want to pull them tight against your scalp. This causes a lot of problems. First, you can pull hairs out that will weaken the locks and root. It'll itch more because more stress was put on your scalp thannecessary. If you pull too tightly, you can actually start traction allopicia, which leads to baldness.
Each lock does not have to be uniform. In fact, they shouldn't be. There should be a certain amount of variation in size and shape of the sections. Doing this will fill in any gaps that appear.
When you wash, if you haven't heard already, your locks will unravel and come loose. This is natural. It happens to all baby locks. Don't try to redo them. It might not feel like it, but this untangling is a step forwards, not backwards. They need to come loose so they can reknot and lock up on their own. Every time you put them back together you are starting over from scratch and they will never progress past the first few days