Thanks for the link! Okay you're not the only one who had some issues with the directions. I wasn't sure what it meant either. If you want it to be evenly increased you have to increase one stitch at the end of every row. That way it will increase evenly on both sides. Or I suppose you could increase on each end on the front side and just knit even across back with no increases.
If you go to Rav and in the projects type in increases you'll see other comments about this issue.