How Does AdGuard add

Maybe a silly question but…
Is there away of adding this in manually, as AdGuard takes it time to put this in the DNS settings this happens on both GLiNet router i have

You can use LuCi or ssh into the router. There are also a number of firewall rules that are set up as well. A restart usually gets it running the fastest I have found.

Hello thanks for the reply when you ssh into the router what do you need to do, thanks

Here is the openwrt guide: