Yes, you can. I've added to several, myself. My tip to you is, position the logo on the correct side of the paper (far left or far right) and use the FULL length of the paper (to the handle on both sides) and tape as usual. That way you have the blank side of the paper covering the existing image. Then cover it with your normal cover sheet/paper and press. You may lose a little bit of color from the existing image but shouldn't be much. Mine didn't lose much at all.