Yay! You finally got it!
It may take a few tries with the lighted cover before it's attached correctly. Make sure to attached the bottom first then the top one will have snap to it when it's in place. You might have to give a firm push the first few times till it's broken in. No gold prongs should be showing at all.
I remember when I first got my cover I was clueless on how to use it. It took me a few tries just to get it attached correctly. Now I can do it like a pro!
Enjoy your Kindle!