Don't know why it does not come up there, but there was a similar problem recently with another plant. Just go to the Daylily database, and type in Barbara. Then over in the blue when you scroll down, you will see a place that says add a plant to your list. It came up that way when I tried it.
If you are in your plant list and want to do it from there type in 39338, that is the plant number for Barbara and that will also work.