You can access your Silver/Gold membership within your account by logging in at www.return.me/site/login with your account e-mail and password.
Once you have logged in, you should be able to see the discount code at the very top of your User Dashboard as you can see in the following image.
If you click on the banner itself, the discount code will automatically apply to your order. You can also enter the discount code to your order as you checkout. For more detailed information on how to redeem your discount code, please visit the following ReturnMe support article: How do I redeem my discount?
Please note that Bronze members do not have access to a discount code for additional discounts on ReturnMe tags. This feature is only available for Silver or Gold members. For additional information on membership features, please visit our Membership page.