Training a tag on the RFID WIZ couldn't be easier. Simply hold the tag over the red reader board and press the "Train" button.

You'll see the Status light flash green, and you'll see the green LED by the Relay light up as well. This will stay lit until you remove the tag. The green LED displays the state of the relay and 5v logic output. You'll also hear the click of the relay when it changes state.

You can repeat this process with multiple tags.  Training up to 20 tags has been tested with stability. Upwards of 40 should be possible but attempt at your own risk