For some people, simply adding names to a list is all that is required. It is a record of who you want to send a card to. It can also be used to print address labels etc.
However, a list can do much more that that. You can use the list to track when cards have been written, sent and received, for example. You can also tag cards as being hand-delivered, or as eCards.
If you look at the names on the list, you will see a blank rectangle to the left of each name. Changing the status is achieved simply by tapping this rectangle.
Tapping the icon again returns it to the blank status.
When you receive a card from someone on your list, if desired, you can record the fact by tapping the envelope icon to the right of that name.