From the last post you can see how the planking slots together with the bead & cove edges. The idea is to have the cove at the top, in order that you can trickle glue into it.
The bead of the next plank fits into the glued cove. The planks are screwed to the moulds as a temporary fixing: the screws will all be removed and the holes filled when all the planking is in position.
The greatest problem is the quantity of glue to use. Too much and it squeezes out everywhere. If it doesn't squeeze out you are left wondering if you've used enough.