How to add colission for a punching?

I imported a skeletal mesh as a player character and now imported a punch anim and made a blueprint that plays punch anim when leftmousebutton pressed so now how to add collision to it? like i want it to interact with game world object .in unreal engine 3rd person shooter tutorial they shows how to do it but my script play punch anim is different from them so here is the video of theirs BP 3rd Person Game: Add Physics Components for Punching | 21 | v4.8 Tutorial Series | Unreal Engine - YouTube . my blueprint is like this shows on video - YouTube