Orders marked with the red triangle icon have an invalid addresses and will need to be updated before they can be shipped. The red alert triangle will appear in place of 'C' or 'R' or 'I' under the "Address Type" column, represented by the House icon.
You can click the red triangle next to an order to edit the address.
If the House icon does not appear in the green header bar above your orders, the "Address Type" column can be added using the "Arrange Columns" option. Learn about organizing column headers on the ORDERS page.