MV1000 Brume - network question

Hi antifascista.
I’ve reset the MV1000 several times and tried to follow your instructions, but can’t get wireguard to work after converting WAN to LAN.
I stopped DHCP, changed the local IP address to be in line with local network, then changed WAN to be LAN.
I can connect the client, but can’t access the network. Tried adding wireguard to Lan zone, but it’s already there.
Also, you mention turning DNS on (not got to that part yet). Can I use Cloudflare DNS for this, or does it have to be one of the other DNS settings?

Cheers