Setting variables in projectile component?

In this answer here they show a node called “set” in the blueprint construction, where they are able to input the values of exposed variables into the projectile settings.

How do I get this node to appear? I cannot seem to find it anywhere!! (using 4.7)

In the example that you show, they simply dragged the Projectile Movement Component inside the editor. From the Projectile Movement Component Reference that you just got, you can drag out and search for Set Initial Speed.