Slider widget

I am trying to implement slider widgets that will control my Niagara particle system but I am getting stuck - does anyone know how to do this? I have made user params in my system but I am unable to connect it to my slider widgets - thoughts? Thank you in advance!

You need to get the reference to your Niagara system in the widget.
Can you explain your setup? How the Niagara system is spawned/added to level, what class created the widget, etc.