Setting component properties

I have a projectile from the MyProjectile-blueprint which comes with the FPS template. In relation to this I want to set one of its properties “Initial Speed” to another value, depending on some (charge-like) mechanic.

How do I set properties that belong to the component, like for instance, the Initial Velocity property of this component?

I think this is the node: (template blueprint from effects-content).:
I assume “Screen size” should be my float variable and the target should be the projectile component? How is this set-node created to target the component’s property? I’m not able to find it in the list.

In your event graph, drag “projectile” from my blueprint (on the left) and drag from it a “initial speed”