Wiget button to move Camera "Character" fixed distance

So I made 16 materials, made a material array inside of the character and I have him placed in front of the camera. And theres a dynamic material set up in the character. There’s a widget with left, right, and select. I can’t find any videos saying how I can click those buttons to cast to the character and go through the array values, loading up new skins on the character in view. (The character is not the player at this level. Its the “color picker controller” which is basically just a camera