All you have to do is contact EA at http://help.ea.com/en/contact-us/new/ asking them for a beta access (be logged in with your origin account). They will add it to your account in about an hour.
Steps:
Select Titanfall from product list
Select the platform - PC obviously
Select topic - Titanfall beta access
Click the "email" link and say that you would like to get BETA access to Titanfall to try it out.
Proof: http://i.imgur.com/98mQdow.png
EDIT: Nevermind lol. I saw this on reddit and thought I'd share. Was for beta LMAO.
Steps:
Select Titanfall from product list
Select the platform - PC obviously
Select topic - Titanfall beta access
Click the "email" link and say that you would like to get BETA access to Titanfall to try it out.
Proof: http://i.imgur.com/98mQdow.png
--- Do not buy it from anyone, I'll close the thread once it is patched ---
EDIT: Nevermind lol. I saw this on reddit and thought I'd share. Was for beta LMAO.