gmc safari 1990 rear seat help!!

How do i change the rear back seat into a a bed? How do i flatten the rear seat out? I know this is a simple question, but i havent found out how to adjust it yet? Please help me out. Thanks!

If it's a factory rear seat, it's not meant to flatten into a bed. If it's a conversion van seat, then maybe it will flatten out. Factory seats fold forward, but not backward.

To make it into a bed you simply left the seat up from the front and push the back down. My 89 GMC Safari had a seat like that but i took it out to fit my 2 15" Subs and so I could have room for bags.