The first thing we see here is how to insert the shaft safety pins into the shafts. To complete this process you will need four safety pins. While the safety pins are in place the heddles cannot fall off of the ends of the shafts.
The next step shown is taking the bottom four shaft bars and folding them carefully up on top of the upper shaft bars. The shaft supports are raised such that they are up and out of the way for the warping process.
If you are using eight shafts or more, you will need to use longer safety pins. Eight shafts are too bulky to wrap up in the same manner so you simply raise the shaft supports as high as they go and you will have plenty of room to put your warp on your loom.