Press the right hand side button to switch on your Tabcat - the red status light will flash. Press the left hand side (volume) button and simultaneously press button 1. Hold both buttons down for three seconds or until you hear a beep. Then release both buttons. After a few moments the Tag and handset will beep again to confirm the un-registration process has been successful. This will un-register the tag paired with button 1 and allow you to register the tag to a different button or handset. Repeat this process holding down the left hand side button and button 2 to un-register tag associated with button 2. Repeat as necessary for buttons 3 and 4.