I basically put the sticker letters on the canvas and really secured them rubbing a credit card on the surface.
I then spray painted with black paint.The key here is to spray a little and let it dry, otherwise it might bleed. Mine bled a little bit, you can correct it using a paint brush and white acrylic paint, but I kind of liked the "vintage" look it gave it. You can also give it a coat of antiquing glaze.
Let it dry. Peel stickers and you are all done!