Your DECAL arrives as a SHEET of vinyl made up of 3 layers ... 

1. TOP LAYER - Transfer tape (through which you can see the decal)
2. MIDDLE LAYER - The actual decal to be applied
3. BOTTOM LAYER - White/Blue shiny backing paper

POSITION YOUR DECAL

Position your vinyl sheet on the surface, centering the decal and securing it with masking or painting tape.  (The tape acts as a hinge for the project.) You can see the decal through its semi-transparent top layer. 

REMOVE THE BACKING

Flip the sheet upward and slowly peel off the bottom layer. Let the decal rest on the semi-transparent top layer. (If the vinyl wants to stick to the backing, slowly manipulate the backing to help the decal stick to the top layer.)

RUB THE DECAL ONTO APPLICATION SURFACE

Use some kind of hard but gentle edge like a large tongue depressor, wide popsicle stick, or plastic scraper, and firmly rub over the semi-transparent top layer to secure the decal to your surface. Work from the center out on both sides letting the edger act as a squeegee over the decal.

PEEL OFF THE TRANSFER TAPE

Carefully peel off the sticky top layer to fully reveal your decal.  You're done!