Adjusting Parallax Scrolling One Page Only or Multiple

I have 2 questions.

I have a page at http://kratomusers.com/?page_id=3573 and trying to set the parallax scrolling, where it begins. Thanks!!

Also trying to figure out how to use your contact form2. I have one on my
site now under the Contact Us page and I’m not getting any emails
after sending. I really want to use the one with the chat feature,
can’t remember if that’s contact form 3 but I think it is. Wanted to
use 2 until I figured out 3. I have a flexytalk account and didn’t
know If I could integrate that into your contact form 3?