i created a collisionsphere , a little bit bigger than the character so when it hits something ,the whole thing should fire^^
you get access to this “on actor hit” if you click on the collisionsphere/box whatever you could created on the left side of your blueprint where the mesh and capsule component also is.
then click it, and under details scroll to the bottom where all avaivable action are and clik on it (hit, overlap and and and)