Lightning detector project needs LED

I just built a lightning detector with a display, works great but project needs a LED to flash when strikes are detected. Would like some help adding necessary lines of code to make that happen.
Code for project is here: See: CH23 "Lightning Detector"

If you have working code don't make us hunt for it, attach it to your post.
If you are using canned code and want someone to now modify it go to the Gigs and collaboration forum.
People are here to help YOU do work.