Make sure the surface of the egg is clean. Remove the backer from the temporary tattoo and place on the egg where you want it.
Soak the back using the water and the rag according to the tattoo instructions.
Once the tattoo is released onto the egg, remove the backer paper and let dry.
If you'd like to make sure the temporary tattoos stay down, you'll need to spray something over the top. I recommend a clear spray sealer. You could also brush on some Mod Podge.