See below for how to use them. You can't keep him as a pet. How to kill a mole If you don't want to kill them you'd better resign yourselves to having a lawn that looks like the Somme. Big spring held by a small trigger. If you're unsure how to set them the ask in the store where you brought them.
Moles are apparently very sensitive to smell.
Some people recommend you bury new traps in the ground for a few weeks. I bury them in mole hills. However you should handle the traps as little as possible so they don't pick up a human odor. I always use my oldest muddiest garden gloves when setting traps. If you have trouble with this step you don't have moles.