If it is just one line, you can add that to misc.dnsmasq_lines under All settings » Miscellaneous, see also Custom dnsmasq configs not loading.
All settings is available in Expert mode only.
If it is just one line, you can add that to misc.dnsmasq_lines under All settings » Miscellaneous, see also Custom dnsmasq configs not loading.
All settings is available in Expert mode only.