moon reader right Scroll help

[maxy007]

Hi All,
I have Moon Reader installed and am having trouble making the right side of the screen Scroll the Page up or down. It keeps changing the font size.
I have Vol keys set to page up + down Which is what I Also want.

Depending on how hard I press on the right of the Screen The font will change or the Page will scroll.

How do I set it so the right side Scrolls Up and down and the left Changes the font size?

thanks
Maxy