Yeah what they said. Level the whole nose part, and the back edge will be just a bit higher because it swoops up a bit at the back edge. If you feel yourself slding forward too often then tip the nose up 1/8" or so, then ride again. If you feel your front girly bits are getting too mashed then tip the nose down a bit. Find the perfect balance slowly. Start with the saddle sitting right in the middle of its rails (forward/backward) and only make adjustments one at a time, slowly.
Every tiny adjustment will make a significant difference. Wear a good chamois and put something like chamois butter or hand cream on so your "bits" can adjust and change position if they need to as you ride. Prevents chafing, etc.

Expect it to feel slippery for the first couple of weeks, and expect to be sore at least the first few rides. Your sitbones will stop feeling sore after a week- it's like when you first start doing anything different physically- you are sore at first then it's ok.

Love my B17! But one day I will get a B67 like Knot, because my sitbone dents are touching the edges of the saddle frame, and I know it should be wider.