How can i change my material instance variable from my blueprint?

Development Programming & Scripting
1

Hello everyone can anyone help me?
I have this material (img.1) and its material instance (img.2) and I wanted to change the Texture_Mask (which is in the instance material) in my blueprint when clicking the button.
Does anyone know how i can do it?

2

This video may help.

UE4 - Tutorial - Change Textures at Run Time - YouTube

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