Bezel iOS App: Once logged into your account, click on the Collect icon in the bottom right of the screen. From there, click on the gear icon in the top right which will take you to your settings. If you click on the green box showing your Bezel Credit balance, you will then be able to see your referral code that can be shared.
Desktop: Once logged into your account, click on your name in the top right of the screen. A dropdown will appear and you will need to click on "Refer a friend."