You have the option to edit or remove any previously used delivery address as well as change the default method that is first shown at checkout.
Once you are logged into your Rivly account, proceed to your Profile page under the user dropdown.
On this Profile page, you will see a list of sections on the left, one of which is called Shipping Addresses.
In this section, you have the ability to edit or delete any saved shipping from the results shown as well as specify which address you would like to make the default address first shown at checkout.