Usually, you attempt to remove the pen holder when you transport or you are going to repair your board.  So, first, you need to turn off your interactive whiteboard if you are using it. Else, straightaway proceeds to the next step, remove the pens and eraser from the pen storage. Next, you need to disconnect the modular cable below the tray. Now, if you have secured the storage tray to its brackets using the two screws, then remove the screws. However, if you have secured the pen storage using the Kensington lock or similar to it, then now unlock & remove the lock. Next, you need to look below the pen storage and pull down the two large plastic clips. Moreover, while applying pressure downwards to the clips, you need to gently slide the tray towards you until it detaches from the two L-shaped metal brackets.