You very gently lift the black tab from the ribbion side. If the black tab doesn't lift very easily, examine it very closely for about an hour. After careful consideration of how the piece may have been engineered, you could try to gently slide it towards the ribbion. If the black bar did manage to slide you should lift it gently up off of the ribbion. As you slide ribbion out take note of which way the contacts are facing if you plan on reassembling your device later.