You just need to connect your H9 to H9 Control and then click on the store button in the bottom menu bar of H9 Control. When you go into the store, a pop-up should appear saying that you have one coupon available, and the buy button for each algorithm should alternate between showing the price in dollars (or whatever your local currency is) and "1 coupon". If you click on the buy button, it will ask you whether you want to use your coupon to buy the algorithm or pay in cash.
