I have followed the tutorial "Purchasing Discount Coupons" and have successfully created coupon codes (displayed under CB Subs -> Promotions -- see attached screenshot) when a user creates a certain type of membership. But, I am unable to use the coupons.

Are coupons the same as Invite Codes?

Where would a user input the coupon? Do I have to create a CB field called coupons?

I have read the documentation that comes with CB subs but it only shows how to create coupons/promotions and does not explain how to use them.

I am working on a fresh install of Joomla (3.1.1) on PHP version 5.4.23 with Community Builder (1.9.1), CB Subs 3.0.0 and GroupJive.