Here are the steps:
1. Start by getting a piece of gum and inserting it into your mouth. Be sure that the gum has been chewed up enough so that there are no large pieces.
2. Place your lips as close as you can to the surface of the water and extend your tongue out as far as you can.
3. Keep your tongue extended at all times and blow bubbles.
4. Wait for your bubbles to float.
So this is how you can blow a bubble with gum.