Access to LAN devices via VPN

My GL AR300M mini router is configured as a client, I have a contracted VPN service.

What should I do to access devices from the LAN part of the mini router using VPN service.

You need to forward ports in your VPN service and configure port forwaring in luci.

Could you guide me step by step how I do port forwarding?
I’m using NordVPN

First learn how to restore your router to factory settings in case something goes wrong.

Quick web search reveals: OpenWrt setup with NordVPN | NordVPN support

I completed the luci configuration as per the guidance you forwarded.
I need help with port forwarding for my PC to find my mini router

The second link has info about port forwarding.