a quik ? on projectile collision

I am trying to follow a tutorial on costume projectiles. the tut throws a flaming chair. I am using UE 4.10.1 and cant get the chair to collide with anything. I go to the projectile movement and set the collision and the bounce but it doesnt work. Can someone tell me how to do it. all the tut says is to set the collision to “block all” and check the bounce. I do that but it blocks nothing and does not bounce… please help

i figured it out. when you start a new actor blueprint certain defaults are created. when you add a new colllision it has to be made the “default scene root” to do this. in the component tab of the viewport, the collision ofject you create need to be move to on top of the default scene root. all is solved