Where to enter a discount COUPON? Olivier Zetlers April 29, 2018 16:30 Follow On the payment page, look for the "Coupon field" as shown below. Related articles How can I declare legal sources for my content? It says "Blast completed" but I can still access the infringing page. Is something wrong? Are my credit card details safe with Blasty? Comments 0 comments Article is closed for comments.