I looked, but all I found was Old video that doesn't describe much and for a previous version. I was unable to figure out how to make a "Hurt Box" To add range of attack. :-/
From what I could gather you use powerups Here's a video explaining how to implement melee attacks, it's from an older version of buildbox so some of the menus will be different but I believe the process is still much the same.
Thanks the Video helped alot... You have to remember to Add Components Wake Up and Spawner. Have you tried this yourself? I got it working but I can't figure out how to make it so it Doesn't propel your character forward for Projectile. I've been tinkering around for a bit. No Luck. But at least this works mainly for A Dash Melee strike. Projectile still needs some help.