Hey there!
It depends on what you’re trying to attach. Sounds like you’re looking to spawn a particle projectile from the socket? You can use a Spawn Emitter Attached node. Simply link your character’s reference mesh to the Attach to Component input, and enter the socket name where it says "Attach Point Name. You’ll want to attach a preview asset to your character’s socket in the skeleton viewer so you can properly orient it if need be. To get it to fire depends on how you setup your code, but this is how I’ve pretty much handled magic casting projectiles with my characters. Good luck. =)