ZX250R Seat fitting?

Hi guys
My bike came with the cowl attached, which is great, and I've also got the passenger seat. I've read the instructions but I can't get the passenger seat to fit when I try to swap them over.
I can see where the tab is supposed to slide into the slot, but it just won't go. Is this a common problem or am I not holding my mouth right? Several people have had a go and we still can't get it to click into place.
Any suggestions?
My bike came with the cowl attached, which is great, and I've also got the passenger seat. I've read the instructions but I can't get the passenger seat to fit when I try to swap them over.
I can see where the tab is supposed to slide into the slot, but it just won't go. Is this a common problem or am I not holding my mouth right? Several people have had a go and we still can't get it to click into place.
Any suggestions?