Unfortunately you are in over your head on this one. I would try to find somebody with a bit of knowledge to help you out and get it running correctly.
As Grit dog said the pancake thing is your air cleaner. It should be held down by a center wing nut which I see in your first picture. If that nut is tight the cover should not be lifting.
The foil tube you can pretty much ignore. It is only there for emissions when the engine is first started to make it run a little better. After the engine is warm the foil tube does nothing. Plus the top end of the tube that it is supposed to hook to looks like it isn't set up correctly.
If you're interested though, the foil tube is a heat stove tube to bring warm air up to the air cleaner when the engine is cold. The bottom of the foil tube should connect to the heat shield off the exhaust manifold. So basically the bottom of the foil tube should slide over a round piece of thin steel to bring heated air up to the top of the engine. The top end of that foil tube should go to the air cleaner housing.
In your last picture there is a round can with a red wire laying on top of it. The top end of the foil tube goes to the bottom side of that round can. It goes underneath the can, not on the open side that we can see in the picture. That open side just stays open so the engine can get some air. But you are hooked up wrong. The foil tube is on one side of the engine and the air cleaner opening is on the other side of the engine. So either loosen the center wing nut and rotate the air cleaner until the part with the small round can is over the foil thingy. Or move the foil thingy to the other side of the engine.
