It will only ask for the Data Bridge serial number, but all of the MySQLi server behaviors are included.
They aren't accessed through the main menu. They are accessed by pressing the plus '+' button from the Server Behaviors Panel. Select "Server Behaviors" from the Dreamweaver Window menu.
I'll refund your MySQLi purchase now. You may need to uninstall it and reinstall DataBridge if it asks you for your MySQLi Serial Number.