Setting up Limit Switches on the Sculfun 9 for use with Light burn

I am trying to set up the limit switches on my laser engraver. When I spoke to the supplier they said I had to do nothing as light burn would Automatically recognize them.
I pressed the home button and got the error message Error 5 Homing cycle is not enabled in your GRBL settings.

I tried to find the GRBL settings and am totally lost as Have no idea where they are or how to set them

Take a look at this guide:

Basically, you need to set $22=1 (you can enter this in command line), though if you don’t know where to find machine settings, you might want to look into the other starter articles in the wiki as well:

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