The play designer lets you create complex animated plays and share them in the play library. The fastest way to get up to speed with the play designer is by following the quick start tutorial which takes you through creating a play and highlights the major features of the designer.
The area where you design plays is called the “chalkboard” and it has several buttons that let you view, save, and modify your play and the designer. Take a look at the chalkboard buttons cheat sheet for an overview of what each button does.