How to install and configure Adguard Home for OpenWrt

I use openwrt 23.05.2. I want to install Adguard home to block ads. From the user interface I have installed adguard home. I configured adguard http port to 8089, DNS port to 5353. But it seems it doesn't work because it hasn't blocked any ads. I think I haven't configured it enough and correctly. Is there any instructions to upgrade Adguard home to OpenWrt?

Probably still quite relevant [HowTo] Running Adguard Home on OpenWrt, start at 2.2.

I followed this guide but got stuck in 2.3 because there is no iptables command in the system. I'm not a network expert so I don't know which command is equivalent to the iptables command in the tutorial. If you know, please guide me.

You don't need it to get it to work, it's for hijacking outgoing DNS requests from the clients.

You can use https://openwrt.org/docs/guide-user/firewall/fw3_configurations/intercept_dns instead.