Using Add Impulse or changing velocity should work fine. Just make sure you zero out velocity values before doing so or you could get different results when falling, jumping and so on.
I don’t have my editor open but if I recall Z is up/down and X is left/right. x1 + z1 impulse would shoot him up and right while x-1 z1 would shoot your character up and left.
If you’re having a hard time I can show you an example of my wall jump blueprint which uses the same idea.