What am I missing? I’ve added the Max Mount, Passenger Comfort seat, Drive Comfort seat, Folding Backrest, the pannier, and saddlebag right away. I then ordered a trunk off EBay. But I can’t get the backrest and seat off. Other than the locking tab on the seat. Is there something else that I’m missing to remove the passenger seat? Thank in advance!

It should loosen up after use. Push the seat locking tab up from under the max mount & you might have to give the seat a thump forward. Mine was tight at first but now slips on/off with ease. Blessings!