To use the wax, light the wick and drip wax onto the place you want the seal to be. Once you have a small puddle of wax, press the seal into the wax puddle, hold it there for 5-10 seconds, then remove it. With practice, you will develop a sense of just how much wax to use and how long to hold the seal in place.
This wax is designed to crack when the seal is broken.