Tell us about yourself!
does it stick on Prismacolor markers and ink pens? I tried it like that, and the ink pen looked faded on the paper, and the color didn't even go on the tape.
Try making sure that no air goes through except the hole between your thumbs.
You don't blow in the whole between your thumbs, your bottom lips go below your knuckles and top lip goes on top. If it is still not working, make sure that no air except the hole in your fingers blow out.