To start working with a database using Generate Database, Database Modification, SQL Execute and Reverse Engineering functions, you have to connect to it first. To do so, please, follow these steps:
1. Select the Connect ( 
) item on Database tab of the Ribbon, or press Ctrl+Shift+N. The Database Connection Manager will appear.
2. Select one of the defined database profiles in the list or add a new one.
3. Click OK to establish connection to the database.
See also:
Database Functions: Database Generation | Database Modification
Database Accessing Tools: Database Connection Manager | SQL Executor | Disconnect from a Database
Reverse Engineering and Import: Overview | Reverse Engineering MySQL Database