Open the cabinet door and clean the inside of the door with a cloth dipped in denatured alcohol. This provides a clean surface for the adhesive on the felt tab without damaging the finishing of the cabinet door.
Close the door slowly and observe where the inside of the door meets the face of the cabinet frame. Make a mark on the inside of the door with a pencil near the top and bottom corner where the door meets the cabinet.
Peel the plastic backing off of an adhesive felt tab. Open the cabinet door and press the adhesive side of the felt tab onto the back of the door at one of your marks. Press the tab firmly to ensure that it adheres to the door. Repeat the process for the other mark on the cabinet door.