On Behalf of Whites, our sincerest apologies!! Cutting a hole is not a big issue, not trying to downplay the hassel you have incurred, but it is pretty straight forward. The screnning was placed on it so the neoprene would not tear, so cutting it will not cause it to fray.
Take a reasonable pair of scissors (not your kids' barbi scissors) and pinch the "middle" of the circle on the skin - cut a very small hole in the center. From that circle cut outward on the inside of the main circle so that the hole is SMALLER than the valve end and the circle indicated - the tech skin will stretch around the valve. It's not the end of the world if the hole is too big - as the valve itself is far larger.
Make sense?
Bottom line - cut a hole about an inch in diameter inside the circle indicated.
Again - our sincerest apologies.
Tyler