I have been trying to set up a promotion 7 times today. I get to the same point and I can't get any farther.
I select the discount for the sale (15) off, then I select the listings for the sale(over 500) and that's where I stop.
The next step is to "review and launch". That button is not working. If someone can help me, please contact me using this listing number 225956935315. I can never find any responses to my questions because of so many questions on this forum. That listing number will get to me directly with the (contact the seller) button.