Right-click on the little image of the iPhone in the MobGUI window, and make sure that you're on the Native iOS Controls set.
Subject, and the Multiline Text control as
Body. The size of the
Bodyshould be made big enough to enter a few lines of text.
iOS Controls 1set and drag two Buttons onto the card window. Name one
Done, and the other
Send. You should have something that looks like the following screenshot: ...