How to outline highlight of an object in 4.20

I have a material to highlight but i don’t know how to make the objecf highlightable with BP nor with c++.
How i can do it?

Thanks fro your responses

are you using a post process material to highlight? if thats a yes are you asking how to assign the material to be used or how to tell a actor to be highlighted? the latter point is pretty easy you just set the option custom render depth to true.

below is a link to a outline tutorial.