First thing you want to do is head on over to your Account Settings page by clicking your name in the top right corner and select 'Account'.
From there select 'Company'.
Now you can either scroll down or select 'Locations'
From here you can edit the specifics of your existing Headquarters address, but now you can select 'Add New' if you'd like to add a new warehouse location.
Now you'll have the option of either creating a new Physical Address or adding a new Mailing Address (If you'd like to display an address that isn't your HQ).
If you'd like to find out more about where your addresses will show on your materials, click here.
When you're ready to add a new Physical Address, click 'Add'.
Next, add in all the required information and click 'Save'
You can remove, edit, or mark the new locations as your headquarters.
If you'd like to add a Mailing Address, go ahead and click 'Add' under Mailing Address
Next, enter in the PO Box, or other Mailing Address you'd like to use and click 'Save'.