Programming or activating a crystal simply means infusing the crystal with your intentions and desires. What you seek to receive from the crystal is your intent which is absorbed by the crystal during the process of programming it. Your intentions are then amplified and radiated by the crystal.
You can program your crystal by holding it in your dominant hand and asking the crystal to assist you in your intent for your overall wellbeing. You can do this by speaking out loud what you desire to achieve by using your crystal. Later, you can thank the crystal and let it do its magic.