Once you have inserted the clip file you will need to go into the node network and connect the new imported nodes, I imagine there were instructions to help you with this in the post where you got the clip file.
As far as I remember, can't check just now as I have something else rendering, you use a Voronoi 3D Diff Scalar with either a Power or Colour Adjust applied to it as the input function of a Displacement Shader.