Set my adguard home dns lo openwrt router

How to get this working?

reread your thread topic, and explain to us what you want to do ...

I have installed adguard home on my windows pc. How to get dns working on my openwrt??

by installing adguard home on the router instead ?

No. My adguardhome is on my pc.

is the computer on 24/7 ?
if not, then having the router use it is pretty .... stupid.

Yes. My pc is on 24/7

does the router have to use it, or is it really for your remaining clients ?

I want the router my to use local dns

your router isn't the local DNS, if it's actually the 24/7 PC ?

I mean my pc as dns server

https://openwrt.org/docs/guide-user/base-system/dhcp_configuration#dhcp_options option 6.

this is for your clients though, not the router itself.