The (+) Button is very important.
Click (+) to add toys and features to toys.
Add a Toy and add a Feature to a toy. To build anything, you need to (+).
Click (+) to add a toy to the scene:
Click (+) to add a component to a toy:
It is as simple as that. If you can add a toy and add a component to a toy then you can build anything.
Click the link below to get started