Arcadyan aw1000 telstra Lost ip address

Hello, I accidentally changed all lan to wan, now I cannot access the settings page, 192.168.1.1
Even the reset button works but after rebooting the same problem remains

You can use failsafe mode to allow you to fix the problems, or simply reset the router to defaults if that is easier.

https://openwrt.org/docs/guide-user/troubleshooting/failsafe_and_factory_reset

Is there a tutorial video, I'm a beginner

There may be videos online somewhere -- none created by the official project, though, so YMMV about the quality and accuracy.

The guide explains it pretty well, but if you have questions about how to do specific things in the guide, please ask here.