All I get is invalid user "name/password combination". I enter it the same as I do for the NA server. Tried dozens of times, same result. I finally found this forum to ask someone.

You would have to have created a new account specifically for the PBE during the designated sign up time. If you did not, you will not have access. You will not be able to gain access until Riot decides to open up more slots on the PBE.

Your Live account is in no way related to any PBE account you may (but sounds like you don't) have.

Great. Thank you.

phail,if i get the same problem but i received the invitation via email and i dont have account for PBE ,where i go to create it?