Help configuring second router

I'm a new noob user of OpenWrt and I can't configure my second router with OpenWrt installed. Router: Linksys WRT1900ACS v2
OpenWrt installed: openwrt-19.07.3-mvebu-cortexa9-linksys_wrt1900acs-squashfs-factory
from Table of Hardware: Firmware downloads
I have the main router connected to the WAN port in my OpenWrt router but there is no internet (everything on default). I used to have Linksys, TP-Link, and DD-WRT firmware working but not OpenWrt.
I want the second router (with OpenWrt) to have a separate network with different subnet IP.
Like this picture

Please help me configure the second router.

Change the LAN IP of the OpenWrt router to It should then work with everything else default.

Routing does not work if both networks are the same IP range, and OpenWrt's default is 192.168.1.X same as your existing network.


I had trouble changing it through the web GUI. I used Putty with these SSH commands

uci set network.lan.ipaddr=
uci commit
/etc/init.d/network restart

and it worked. Thanks for your reply.

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