Just trying to be helpful here.
If you got the pre-order for PS3 and have the manual then there is an access code in the back cover of the manual to put in. You must go to the PS Store and choose "redeem codes" under downloads.
You do not need to redownload the game you can exit once the code is put in unless you don't like the "your code redemptin is not complete until you download the game" message. I personally can put up with the message not to have to do another hour of DLing.

If you have a digital download then you have to go to the GameStop, SE, Amazon, or other site and track down this code that way probably through "digital orders information" or a similarly titled tab/selection.

I hope that helps.
Took me long enough and I ahve the manual which has the instructions in it...just got confused not knowing when the early access was over (today).