The pre-order bonus code is for early access, you won't get the code for the actual game until you receive the hard copy through the post. If you've pre-ordered the digital version then I'm not sure about the full game access code, maybe someone who has pre-ordered the digital version could clarify that for you.

In the email you received there should be a link to the site where you enter your code to get a 20 digit code for PC or I think 12 digit code for PS3. I'm from the UK so I went to the EU site: preorder.eu.finalfantasyxiv.com - if you're from NA I presume you replace the eu with na.

Hope this helps somewhat!

EDIT: Okies ignore, I was typing this as you were editing your post :P