Beginner Here! Need some help setting up OpenWrt router Archer C20 V04 as a guest network

Installing and Using OpenWrt Network and Wireless Configuration
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Hello guys.I have a Archer c20 Router with a OpenWRT image flashed in it.
I have been trying to use it as an Wifi-range extender via LAN cable (LAN Cable connected from Main Router to Archer c20 guest router).
I have connected ethernet cable from LAN port of MAIN ROUTER(ISP Provided) to the WAN port of my archer c20 guest router.
The Archer C20 router is receiving internet as I can see INTERNET LED blinking green, but can't able to USE internet via Wi-Fi which I had setup already. So, Internet is available to guest router from main router but no internet via Wireless interfaces or Wi-Fi. (I can only change settings in the guest router as the main router is a Public router of my apartment).
So, help me setup the Guest network Openwrt settings. Thanks.

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I think this would be a more fitting setup, probably meeting your expectations (it's not a repeater, it's just a normal AP setup):

Should you need it to regain access to your device:

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Thanks a lot @slh . Everything's Working great.

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