Thoroughly clean the surface area of your existing Ford badges so they are clean and your finger does NOT slide across the badge easily, do not use any spirit or oil based cleaners as these will stop the glue from working.
If you are in a cold environment you will have to warm the badges up with a low setting on a heat gun or a hair dryer.
Warm the backing paper first to a reasonable temperature (hot enough not to burn yourself) and then slightly warm the surface of the original Ford badge make sure both are warm before attempting to attaching badge.
Peel the badge from the backing and stick it carefully to the original badge making sure the edges are lined up and also stuck down. At this point you can slightly warm the edges and apply pressure to make sure they are fully stuck.