dbForge Studio for MySQL is installed with the Sakila sample project. This project is based on the Sakila MySQL sample database. The project can be found in the folder: My Documents\dbForge Studio for MySQL\Projects.
To open the Sakila project, in the top menu select File->Open Project and open the Sakila.mydev file. The Project Explorer window opens where you can see and work with the project objects.
You can find the description of the schema structure in http://dev.mysql.com/doc/sakila/en/index.html. Note that this project requires MySQL 5.0.13 or higher to deploy all the features.