Don't worry about it, sometimes if you apply the decal at an angle or there is a drastic heat change soon after application air bubbles can form.The bubbles may go away with time, otherwise you can try to use a flat object like a credit card to flatten them out towards the edge (to release the air).As a last resort, you can try to use a sharp, pointy object (needle, safety pin, or very sharp razor blade) and poke the air bubble in the center. Do NOT drag! Once the bubble is poked, flatten it with a flat object (credit card, etc.)