How to Use Coupons and Codes How to use Jans.com coupons and promo codes: Click on your shopping bag to see your order summary. Choose one of the promo codes below and enter it in the labelled field. Click APPLY to see your discount and continue checkout. Related Stores Cross Coupons Marmot Coupons Paper Source Coupons Calendars.com Coupons Sunny Sports Coupons