Distance Score Infinite Jumper

I'm just having trouble understanding the theory in Construct 2

Here is what I have now

<img src="http://i61.tinypic.com/33bogic.jpg" border="0" />

can you tell me where I went wrong

On start of layout

• set startY to toby.y

NEW EVENT!!!!!!!

System| round(abs(toby.y-startY))>Score

• set score to round(abs(toby.y-Starty)
• set text to Score

On start of layout is only triggered once (on start of layout!)

I tried it over and over again, I don't know what I'm doing wrong, is it possible to give me a capx example so that I can study it and learn from it? That would be great. Last hope.

any screenshots for people who really know nothing about variables and how to set them? :D