To see your reward balance login to your account and click on "Your Profile" and "Redeem Rewards". You will then see your balance and if you have reached the level to make a payout you will be advised that you can now choose to transfer your money to your chosen payment method.
Click on the "Redeem" button and then "I agree". Your payout transaction will then change to status "pending" in your recent activity. Once the payment is processed and sent to you the status will change to "success".