Nav is 2nd block, looking to make it pop up when scrolled down to

I Need Help
1

I have a main splash screen when the user visits the site. I have the navigation bar hidden under it, so it will fade in once the user scrolls down, revealing the rest of the site. How do I go about adding my JS to make this happen in Blocs? Or is there another way this needs to be done with this software?

I already have the couple lines of JS needed to perform the task, just not sure how to make it work with blocs.

2

Did you get any help with this? I had one working, and when I updated from 4.1.1, to the latest edition, it wiped it out. Now it does not do anything but stick when it finally arrives whilst scrolling.