We asked for directions at the front desk of OKW and they were very helpful.
For what it's worth, we found a MUCH better selection at the Belz outlet than Prime Outlets. Belz is quite a bit farther (about 25 min drive vs. 10 minutes for Prime), and it's not the easiest location to find. But we walked out of there with over $100 worth of stuff vs. nothing at the Prime.