First, confirm whether you have an account in Catalina. If not, you can create it first. Then select your favorite Catalina product and add it to the shopping cart. Click the calculated button, and finally, jump to the Catalina payment page. After clicking, you can select the Catalina Promo Code you need to use, and then return to the payment page to continue the payment. It should be noted that the used Catalina Coupon Code will be automatically removed from your Coupon.