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The water will help the image transfer onto the adhesive surface of the tape. Let the taped image soak in the warm water for 5 or 6 minutes. The water should be warm to the touch, but not hot. Hot water may melt or deform the tape and image. Pull the taped image out of the water, and lay it flat on your working surface. Using your index and middle fingers, rub back and forth across the paper side until the paper rolls and flakes off of the tape. If the paper doesn't rub off completely, re-submerge it in the warm water and let it soak for another 2 or 3 minutes. Then, pull the image out and continue rubbing off the paper. Once you've removed all of the paper, you will be left with the strip of packing tape with the image transferred onto it. Pull out a blow dryer and use it to fully dry the strip of tape. Once the tape is dry, you'll notice that one side has become sticky again. If you don't have a blow dryer, set the piece of tape flat on your work surface. Let it dry by air, which will take about 30 minutes. You're now ready to apply the image onto the glass. Center the tape above the glass, and lower the adhesive image until it's resting against the glass surface. Then, using your fingers, press the tape firmly onto the glass. Start at the top or bottom of the tape and work your way to the other side, to avoid trapping any air bubbles under the tape. If you find any air bubbles once the tape is applied, smooth them out from under the tape using the edge of a credit card.
Submerge the image into a glass of warm water. Rub the paper off of the back of the tape. Blow dry your image. Press the adhesive side of the image firmly against your glass.