How to change the position of the Scroll Up

Hey Sakin, I just got your theme recommended by a friend. It seems very fast ( so far ) and very clean. I'll be considering buying the Pro version, after I get the taste of how the theme is built. I've been poking around, and I can't find a way to change the position when the 'Scroll Up' button shows up. In my opinion, it takes too much scrolling before the button shows up. I try to make my pages quite short, but I'd still like to offer it to my visitors. I know the setting is usually an 'offset' variable , in javascript, but I can't see that setting anywhere. How can I do that ?