As the process is confusing for the PS3, this is how you check to make sure you're ready for early access. Go ahead and power on the PS3 and follow these instructions. First you need to enter your new code by going to the http://preorder.na.finalfantasyxiv.com for your region. Once you plugged in the code, you'll get the second code for Early Access. I don't think you need to install the file again as it's the same client from open beta. Next follow the instructions below.
Under the PlayStation Network icon...
1. Go under Account Management.
2. Then Transaction Management.
3. And finally, Services List.
Once you do this, you'll see FFXIV ARR. Press X and you should see both Early Access and Open Beta slots.
I hope this helps, I feel better now that this worked for me. If you press X again under Early Access, you'll see 1 remaining which appears to note that you can only use this once.
Added this from Phoenix's post.
If you prefer to check online instead, go to https://account.sonyentertainmentnetwork.com/cam/media/media-list.action
Edited, Aug 21st 2013 4:54pm by ShadowedgeFFXI