Once you start the game, you'll find yourself in a short tutorial, where you learn how to interact with non playable characters, inventory and items found in visited locations. Your task is to fix the junk press visible in the middle of the screen.
Pick up Yin in front of Rufus. Open the inventory and notice, that I addition to just found item, you also have Yan. Combine both items, obtaining Spare Part. Close the inventory and use the spare part on Inconspicuous Slot. Now press the Button visible on the left. Rufus will be ... pressed.