Chapter 10 Install and System Administration for FortiOS 5.0 : Central management : Adding a FortiGate to FortiManager : FortiManager configuration
  
FortiManager configuration
Once the connection between the FortiGate unit and the FortiManager unit has been configured, you can add the FortiGate to the Device Manager in the FortiManager unit’s web-based manager.
See Also
FortiGate configuration
Configuring an SSL connection
FortiManager configuration