Where exactly do I find the Battlefield 3 Beta to download on the Playstation Network?

Ive been looking on the PSN and I cant find the Battlefield 3 Beta demo to download. Help please! Thank you|||bf3 so hyped its a letdown and saying on tht comment earlier tht the graphics are great thy ent tht good . stfu retard|||I think you need to register with the origin before you can download|||Wait till noon