This is another skill that I see people interested in, I myself don’t do it as I see no point, but here is a rough idea on it.
Flaring is basically causing a energetic construct to be more so visible to the physical eye, it is almost impossible to get fully invisible but you could cause slight distortions that are easily overlooked if you are good enough. Or if you can see energy yourself you will see it a lot better in this area..

This is a bad skill to use a lot as it uses a lot of energy to do and there isn’t much of a point in doing it other than to show off or similar.
Flaring is done through literally concentrating enough energy until the point you can do it anymore. Usually this is what is considering flaring but IMO you should program the energy to output a bit of “energetic photons” or light.