Simply log-in to your Gamers' Guild Account, navigate to the "Rewards" tab, and you should see a list of rewards available for you to claim!
If would like to use your points to claim an eligible reward to use on a purchase, just hit the “Claim” button next to the reward you want to use, read the conditions in the pop-up carefully and click “Redeem” if your purchase meets those conditions.
The discount code generated can then be copied for use at the checkout, either in-store or online.