You can add a shipping address requirement as you create your Tiers, or add this requirement to existing Tiers at any time.
- Scroll down, expand the Advanced section, and select the checkbox in the Shipping address field, to request this from patrons during membership confirmation

Once you've added the Shipping address request to your Tier, it's a good idea to message existing patrons. Let them know you're collecting patrons' shipping addresses and why. Feel free to link patrons to this article to update their membership: How do I change my shipping address?