Step 1: Cut the contact paper to the size you need.
Step 2: Peel off part of backing paper and fold it down.
Step 3: Stick the exposed adhesive foil to the surface.
Step 4: Smooth the paper by using a clean cloth. In the meantime, please continue to peel off the rest backing paper bit by bit.
Step 5: Remove air bubbles by smoothing the paper from the center to the edges.
Using adhesive tape can help you to remove the backing paper easily.
If some air bubbles still remain, pop them with a pin and smooth the paper.
Please make sure that the surface is flat, clean and dry from any dust.
Color tones may vary due to lighting in the room, pictures for reference only.