motion controller interaction

Ok, I know that is a very newbie question. But normally scripting or use blueprint isn’t my job. I’m trying to create a sort of video interface, you click on the icon and start a video, Click on the other icon and start another one. I have to change the material on the mesh clicking on the various icons. I have to do it with with the motion controller of the htc vive, in the photo the incompleate bp that I try to do. Using the input grab I have to interact with incon1 (or 2) and change the material in the mesh pop up. Help me please!!
unfortunately, it’s very urgent :frowning: