MIC is a material instance constant which you can read up on here:
Basically you create one by right clicking on your material in the content browser and selecting create material instance. The material instance will be a child of your parent material and when you add scalar parameters and so on in your material, you add functionality to the material INSTANCE which can be edited more quickly.
This is what the material EDITOR window looks like and how the scalar multiply should be setup. (don’t worry about the texture looking weird in the material editor, it happened for me too)
And this is the material INSTANCE window, which looks different to the material editor. You can see I have parameters for the roughness, metallic and SCALAR. (which I should have probably named uv scaling)
If I change the 1.0 value to 2.0 or 4.0 or whatever it will scale the material UV’s, in essence replacing the texture coordinate as the UV scaling option.
Remember to check the tickbox in the parameter value to edit the values in the MIC.
Hope this helps 