To connect to the database use the File->Connect to shared database main menu item. The following dialog will appear:
To add new connection click on the Add button. The following dialog will appear:
Here you need to select host, port, database and login and password. Click on the OK button and connection will be created. To initialize the database select it in the list of connections and click on the Connect button. The database will be initialized. If you want to delete the connection select the connection and click on the Delete button. To edit the connection select it and click on the Edit button. To connect to the database select it and click on the Connect button. To disconnect to the database click on the corresponding button.