If you look at the pic it has some pieces in the middle. Those swap out for the winged looking things. You just insert them into the stand and adjust them to where they slip under the swingarm. They have a couple different versions of handles. From there you basically just push the handle down. It will take a little bit of work the first couple of times, but you will get the hang of it.
I make sure the front end is straight, lift the bike off of the side stand so that it is straight up and down (balance bike on leg), slide the stand under the swingarm, and push the handle down.