While putting back the I/O cable, I assumed that it just connects back in place with pressure, kind of like Velcro. I just pushed the one on the left down first as instructed, and, while doing so, folded down the tiny wire lever under the padding (As someone stated earlier, the wire lever isn’t on all models) along with it. It seem to go back in place fairly easily if you’re careful to align the two sides (the part under the cable with the part on the logic board). A a novice, I think this warrants being addressed in more detail. Kinda had to do this intuitively.
