LaserGRBL: How to add a custom button!

This video is made by Laser Wizard, a Youtube reviewer.

Here is his channel: https://www.youtube.com/channel/UCRSmgp890HMHBBXewwKOrgg/about

Since FoxAlien LE-4040 Laser Engraver is compatible with laserGrbl, you can watch the following video to see how to add a custom button.