I'm going to be totally forthright: I had an incredibly difficult time finding a good resource for this, and even so, I still really struggled to figure this part out. You're welcome lol
Step one: Count three stitches back. Remember, nalbinding has two working loops so
This is kind of what my three stitches ends up looking like.
Step two: Holding your first row like so, front toward yourself, this end in your hand, the other end generally pointing to the left, and insert your needle.
Yes, I do have a different needle for this. I carved my first wooden needle myself; it was my first time carving/whittling something like that and I wasn't positive what I might want/need in a nalbinding needle. Luckily, it was just wood.
Step three: You don't necessarily have to do this, but I ended up flipping my working loops up closer to the working end of my thread.
Step three-A: What I've done, if you look very closely, is I'm holding down the second of my two working loops. From here, you'll nalbind pretty much as normal. Go in your first loop as normal, and turn to go back, through your second working loop, and under your working yarn.
Step three-B: I honestly found this difficult to photograph with this pale color of yarn, but as with your starting chain, you'll go in the first loop, turn, go through the second loop and under the working end of the yarn.
At this point, I just repeated: Put your needle through those humpy stitches on the top edge of your chain row, hold down your second loop if you need to/find that helps, put your needle through your first loop from the front, like normal, turn, go through your second loop and under your working thread, like normal!
Again, I hope this helps. I tried to really slow down, draw out exactly what I was doing. The great news is, the second row goes lightening fast, compared to the first row (for example, my chain row took like five days, and personally, once I picked up nalbinding, it felt pretty second nature), especially if you were having to stop to adjust all your stitches down to your desired size (by contrast, I got a third of my second row done just in a short, couple hours session).
I think it's a pretty commonly held understanding that nalbinding is gaged by your thumb, but that's not entirely true. If you were really driven to nalbind a scale piece for a Barbie or Obitsu, you absolutely could. And that's super apparent when you get to the second row, when it's easier to work what's called off (your) thumb. Once you're comfortable with nalbinding, try it out!