[Help] How to use a Hit Animation on LMB ?

Hay guys i have start with UE4 a few days ago, i want to develop a small rpg, i have already a “auto/standart hit animation” and now i want to know how its possible to make the animation start on the left mouse button.

I started the Project with c++ and im not sure what i should use blueprint or c++?

Try to follow this tutorial 3rd Person Game with Blueprints (pre. v4.8) - YouTube