
Thats the latch alright. Once the seat is in the full front position, don't sit on the seat, but get on your knees facing the seat, then using your right hand to grab the lower part of the seat, use your thumb on the same hand to hold the latch up, then extend your left arm, and use your left hand to assis your other hand to prise the seat off the rails.
I'm sure I could of probably explained that a bit better, but hopefully you get the idea.