How do I get auto-scrolling to work?

Awww, you're asking more and more questions
Slow down a bit please

There's a thread in this very same subforum about auto-scrolling
And also, if you can't get something to work, the best thing you can do is look at the original levels to see how it's made, and replicate it. Or even easier, take a level with autoscroll, remove everything but the autoscroll start sprite, and make your own level.