When it's time to fly there are a few simple steps. Hook up the power, and properly secure the connector to something to support it in flight...I like to tape the JST connectors, and cable tie them to a fixed point for support, usually a battery support cable tie. Next, carefully slide the sled into the sleeve. There are indexing ridges inside the sleeve that ensure alignment. If the sled does not slide freely, so not force it. Remiove the sled and check that the hole in the back of the sled, and the hole in the sleeve are on the same side, there is a front and back to the sleeve. Once the sled is fitted in the sleeve, secure the two using three of the included 4-40 screws.