Your list must be "Closed" to add cards. On the List Manager page, under the Status column, click on the "door" icon to Open and Close your lists. At the card's page, scroll down and you'll see all your "Closed" lists. Click on "Add to List" in the far right column. When you're done adding cards, "Open" your list to make it public.
Let us know if you need help reordering, removing cards from, or adding comments to your lists.
Someday my cards may double in value and then be worth half of what I paid for them.