Step 1: Click the promo codde that you want to use
Step 2: Select the service pack at GoDaddy.com and in payment
Step 3: At checkout, look for the line: "Do you have a promo, source code or referral code? Click here" is usually at the buttom of the order
Step 4: Click on the "Click here" and paste promo code (that you copied when you manipulate the step 1) into the box, and press "Apply"
Step 5: Let's look at the order and enjoy this wonderful promo code gives you. See more at: http://trendymediablog.com/2014/10/how-to-use-godaddy-promo-code/