Please note: that on the customer page the addresses present are not editable. You must go to the shopping cart to add a new billing or shipping address.
To get to the below page tap the shopping Cart tab, then the shopping basket, tab on the address you want to add (billing address or shipping address).
In the upper right corner tab the "+" sign and fill in the address information you want to add (billing or shipping) and click save.
Once you save the information it will show in the Checkout Options. To see a list of available addresses tap the Billing Address or Shipping Address.
Tap to select the billing address or shipping address to select the address you want to use from the list of available shipping and billing address.