To install the Expansion Board, first remove the LCD screen from your Handy Board by gently rocking it back and forth while lifting upward.
After the LCD screen is removed, insert the Expansion Board into the main Handy Board. The downward-facing pins of the Expansion Board should plug into the socket header that is highlighted in orange in the image below:
After the Expansion Board is mounted, re-insert the LCD screen into the row of socket header along the upper edge of the Expansion Board.
The Expansion Board is now installed!