I farted around with this just so I would be prepared when and if had a flat someday (I would be mad enough for having a flat and would not also want to have to learn the drill at the time).
First, I put the things together wrong so the end that goes in the jack lowerer had a male vs female end (or vice versa I forget). Once I got that right then I couldn't find the hole, so to speak. When sticking the thing up there you need to go UP and to the LEFT a little. It is actually a funnel type shute that guides you in. I was just being a cyclops as this was first time, but now I am glad I already had dry run and got my obtuseness out of the way and will know what to do if it happens on the road.