How to add multiple addresses to the same account.
On an Account Details screen the left sub nav location will have a button titled "add address". Clicking the button will generate a popup. The popup will ask you to input information on the address you wish to enter.
Once you add the desired address and hit save, you can repeat the process to enter multiple addresses if needed.
Subsequent addresses will be saved in a scrollable bar in the left section of the sub navigation menu.