Please apply only to a clean, dry, surface.
Below are some instructions on how to apply these stickers:  

Step 1: Rub the sticker to be sure the transfer tape is properly adhered to the sticker.

Step 2: Clean and dry the desired area. Stickers will stick best to clean smooth surfaces.

Step 3: Remove the paper backing slowly making sure the sticker stays adhered to the transfer tape

Step 4: Carefully position the sticker to the desired area. Once the sticker sticks it will be nearly impossible to re-position without destroying the sticker. Rub the sticker from one side to the other, eliminating any air bubbles.

Step 5: Use a hard-edged object like a credit card to make sure the entire sticker is fully adhered to the surface.

Step 6: Slowly remove the transfer tape. Making sure no part of the sticker remains on the transfer tape.

Step 7 Check for air bubbles. In most cases air bubbles, can be worked to the edge of the sticker, but if not, a pin hole will allow the air out and become virtually invisible, once the bubble is gone.