The Game Manager is the first dialog you'll see after launching RPG in a Box. It allows you to create a new game project or open an existing one. To open a recent game project, select it from the “Recent Games” list then click the “Open” button, or simply double-click on the name in the list.
When creating a new game, you will need to specify a folder to store your project files in and a title for your game. If you are creating a game with RPG in a Box for the first time, importing the example content is recommended so you'll have some pre-made resources to play around with and learn from.