How do I make my player not leave the screen

Hi!

I used a tutorial from Kyatric and changed from "from left to right" to "from bottom to top" and tryed to change the math too. Didnt work...

Help would be nice!

Here is the file: h*t*t*p*s://drive.google.com/file/d/0Bx3WDFOpgBMALW1vUG5TZzZXSUk/edit?usp=sharing

This is the tutorial: h*t*t*p*s://w*w*w.youtube.com/watch?v=iH0NdG7e16E&list=PLfsP5t7ilSnvTabQS7NyxMIjxSs8insfv&index=4

Thanks!

"from left to right" should become "from top to bottom", because x=0 is left and y=0 is the top..

You've probably got some > and < wrong and some - and + because of that..

I'm not in the opportunity to download at this moment, but you might want to look if what I said is the case..

Found the mistake. Thanks