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 reposition 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