Chenge color from HUD selector

Hello everyone!
First of all, I want to apologize for my English, I hope you all forgive my mistakes writing in this language.
I am learning the basics of Blueprints, and I have a lot of doubts, but for now what I want to get is a not super difficult thing:

I have an interior level, a little house with a sofa. What I need, once playing, is to click on the sofa, or just when I am near it, this doesn’t matters, I know how to do it with a collision box, and hitting some key; the challenge is to get a HUD with 2 or 3 color options. Then click on one of the colors and get a change in the material of the sofa depending on what I choose.

I have one basic fabric material (white), and then I created 2 instance materials (black and beige). So I have the sofa, and the tree colors (materials) I want to change.

Could you, please, help me to understand how to create the correct blue print to do this?

Thank you so, so much!