Push Object -Player (RigidBody controller)

Hello, i have problem, my player dont have character controller his moving with rigid body . I wuld like to push box to be able to jump on that box and go to higher level of ground. I did it now with collisionenter in script and with trigger in animator ,and my player is pushing object and do the animation but somthing is not right..I think that is not right way.. can someone HELP?

and this is in script of playerMovement

void OnCollisionEnter(Collision collisioninfo) { if(collisioninfo.collider.tag == "Box") { animator.SetTrigger("pushing"); }

 }