You have to create a material that’s using a color parameter (in a material, hold 3 and click left mouse button, then convert to parameter). Name it whatever you want. If you aren’t using any other image, just color, don’t use those Texture and Multiply nods, just a color parameter.
Create a material instance and apply it to your banner. In your blueprint create the banner reference and upon the required event set its “Color” vector parameter (you have to type in the parameter name manually) where you can choose any color you want (Y X Z are respectively Red Green and Blue).
