Help?

I donated some time ago 10 to skip queue on Icecrown, since then I've come back to Lordaeron. 3 days ago I put my lvl 80 lock on the market and it got sold immediatly-lucky me- and I purchased the Celestial Steed.

Now I can't enter the game, I have a new window "Authenticator" under the password one and I have no clue what that is. Before that window appeared every time i tried to log in-today- i was requested a code...i received like 3 mails with codes, none worked.

Can anybody help me figuring this stuff out?

You don't need to put anything in it, just put username and password like normal. That field is only for people who use Google Authenticator.