DNS server is missing on fortigate 40c

there is dns server on fortigate 40c ? because when i try to make the router as dns server on my computer it's not getting any address

also i don't see the feature here:

config system global
 

set fgd-alert-subscription advisory latest-threat
 set gui-antivirus disable
 set gui-application-control disable
 set gui-dhcp-advanced enable
 set gui-endpoint-control disable
 set gui-implicit-policy disable
 set gui-wan-load-balancing disable
 set gui-webfilter disable
 set gui-wireless-controller disable
 set hostname "FGT40C3913032173"
 set internal-switch-mode interface
 set timezone 04

and this command is not working:

config system dns-database [style="background-color: #ffffff;"]command parse error before 'dns-database'[/style] [style="background-color: #ffffff;"]Command fail. Return code 1[/style]

this is my firmware version:

Firmware Versionv5.2.3,build670 (GA)