Need zipper help with a bowtuck
 

I know, another question about zippers in a bow tuck! Sorry but I have been trying to install one on a bow tuck that I enlarged for a diaper bag and cannot for the life of me understand where to install it? I have made the two strips to attach to each side of the zipper but I am not sure if I attach the strips to the lining or to the outside of the bag? Also, how do I finish the sides of the strips? Won't they stick outside of the bag once its finished? I am totally lost!

I have looked at the tute on this board but it doesn't show all the steps and I am a picture kind of gal!
I have also searched the internet for instructions but no one seems to have pictures, just instructions.
Do any of you know of a website or a tutorial that can explain it to me better?

Thanks in advance!

Well, I was able to get the zipper in the right way but now the piece that is attached to the zipper has the seam showing on the outside of the bag! UGH! Back to the drawing board!