I need to take the seat cloth off!:O

Hi folks, any of you genius' know how to get the upholstery off of my front seats in my bocanegra?, iv purchased some very nice heated seat pads as part of the kit but it needs to go underneath the cloth so really to be fair all I need is them opened up at the back so that I can slip the pads underneath but I'm not entirely sure how to get the back of the seat open at the bottom?????? Need help, please help!!!

So i got the bottom heaters in, its piss easy the back if the seats just clip out on the bottom half of the seat, but i really cant suss out the top half, but the heaters are so cosy its not a massive deal, and its super easy to wire into the back if the cigarette lighter wires

Hah i dunno like, quite alot of responsability! Really think its worth it?:/