Dnsmasq setup

hi,

I need assistance in setting up dnsmasq.
I just can’t get it to work///

I have this in my configuration:
{
“defaults”: [
“8.8.8.8”,
“8.8.4.4”
],
“forwards”: [],
“hosts”: [
{
“host”: “xxxx.duckdns.org”,
“ip”: “192.168.x.xxx”
}
]
}

but just can’t get it to work.
Do I need to set something in my router too?