Fair question. I'll endeavor to update the language to make it more clear for future versions and before I go to print.
Since this is a d12 roll-under system, the intent is that each Stat have a Score. So you should roll 2d6 for each Stat.
This should give you a range of 2-12 with a bell curve leaning towards 5-9 as your average Score.
Hope that helps!