Go to New Condition -> Integer Comparison -> Unit - Level of Ability for Unit. Then you pick your ability and your unit, and there will be an equal to, and you pick the number you want.. hope that helps.
In other words, because you use UMSWE, you'll need to get the newest version to have this functionality, but not because it's part of UMSWE. If you weren't using UMSWE, you'd already have it.
Okay, we're all clear on what everyone meant, now, right?
ok i'll help again... create a new condition go to integer comparison where it says # of units in w/e region, click that, scroll down to where it says Unit- Level of Ability for Unit, click that, set the ability then press ok, where it says equal to change the 0 to what ever lvl you want