Actore Reference

So this is very simple. I don’t know how do create that thing that says “new param” onto my action button node. Here are my blueprints.
One of them has it, yet the other one doesn’t. I need some help! Thanks!

cant really see the images on my end, but from the looks of it you select that node and add an input on the right panel of the type you need it to be for those cast nodes…