You can add shipping addresses either in the order checkout flow or by selecting "Shipping" tab on the left side of the page. Expanding it you will see "Company addresses" & "Personal addresses". Option to "Add new" address is available to create a lists of both type of addresses.
To ensure privacy, one Regular user's "Personal addresses" are not visible to other Regular users.
Under 'Company addresses' You can save multiple shipping addresses for different office locations to which print orders will be shipped. The shipping addresses populated here will appear in the Order Checkout under the section 'Shipping options'. It is possible to select them by country or do quick search. You can also add 'New address' in the Order Checkout flow, to get order shipped to it and save this to the Company or Personal address list in the account.
Important to know is that for orders to China, shipping addresses must be added in Chinese characters and for Russia in Cyrillic.