Lift the top of the keyboard frame and pull it out towards the screen.

Your Reform should now look like this.

When re-assembling the Reform, insert the bottom of the keyboard frame into the main box before pressing it down. If the frame is not straight, very gently un-warp it, section by section with both hands close together.

Don't bend it with both hands on opposite ends of the frame — you'll likely twist it, especially the thinnest parts around the OLED display!