You have to retrieve the mesh you want to add force to.
This mesh must have physics box checked, to be able to add force, and apply torque.
Next the easiest way, is from your static mesh, to retrieve the forward vector, to multiply it by a factor (30,50,100) depending your force, it will waht you will connect at force pin to add force box.
connect your static mesh to target.
Accel change is depending if you add continue force or not, if it is just an impulse, just uncheck it.
Don’t forget to modify damping on static mesh (it is friction in fact :D)
ps: I think for your game, you will need to use add force at location, to precise to where on the ball you want to apply force. Add force, is often used on vehicule, because you just add force from behind to forward.