LL - How to update a Shipping or Billing Address in Shopify
Look up the Customer Profile (Customers Tab on left)
Update the Address and Save.
Note: If the the order is already in ShipStation and is ON HOLD - you will have to arrange for the address to be updated there as well. Use the appropriate ON HOLD procedure.
If the customer has a subscription, you will need to update the address inside recharge so that it will be used for future orders as well.
Here's how: