Each extension cable has blue stripes to denote the back of the cable. On the front of the cable, opposite the blue stripes, are the connector pins that make contact with the FPC connector pins on the extender or breakout.

You'll use an FPC extender with the extension cable. Gently pull the FPC extender black latch out towards you and insert the cable into the slot with the front side facing you (blue stripe facing away from you). Push the FPC extender latch in to secure the cable in place.

Take your display's cable and insert it into the opposite side of the FPC extender. The contacts on the display cable should be facing up, same as the extension cable.

Then, insert the other end of the extension cable into your board or breakout 24-pin connector. Do this by gently pulling out the latch, inserting the cable with its contacts facing up and then pushing the latch back in to secure the cable.