To change or add addresses follow the steps below:
Go to the System tab.
Select the Company button.
In the new window select the Address button from the ribbon at the top.
Click Insert or Edit and select the address that needs editing from the list or enter new details
Make the needed amendments, the Default Order Address is also set from here by ticking the Default Order Address box.
Once done click Save.
You are not able to delete an address but you could follow the step of amending the address and then typing over it.