Now, I have looked at several guides already. I know that where you pinch, two more leaves should grow.

The problem is, I have one very large stem with no real leaf nodes until halfway up, and it's shading my other seedlings. It is in an AeroGarden, so I can't just thin and transplant them elsewhere. I will include a photo so you see what I mean. It looks to me like there are only two main leaf nodes along this stem. There is a smaller set very far down that I will try to show you. But you're supposed to prune only above the first two nodes, right? So I'm kinda stumped, but one way or another those top leaves need to go, they're heavy and I don't want to raise the light hood again until my mint catches up.

The two small nodes I'm touching with my third finger in the third photo are part of that main, huge stem. Do you think I should prune just a bit above these, taking out five sets of leaves and two or three inches? Or should I prune where my finger is on the first pic (it keeps changing the order of the photos as I add them so hopefully that's right) even though the two secondary nodes there seem to be growing from the same spot as the original one?

Appreciate any advice.