In your Create Dynamic Material node the Source Material node is empty so there is no material to change.
Its scrips do not working, isee a tutorials and i dont know why is not changing the colors like this, Architecture Real-time - Unreal Engine 4 Archviz - YouTube , help me please. this is the blueprints i use.
i put a material in source material and i shows the material, but i dont want this i want when you click the ball shows me a hud to change colors
Can we see the material?
Also have you verified (like with a simple print string) that the setColor is what you expect on tick?
You do not need a source material assigned if you want to use the material on the mesh already. The source material slot is only if you want to make a material instance dynamic from a new material not assigned to the mesh.