New user, I see no realms

Hi, I have 2.4.3 client (did not download), I set my realmlist.wtf to: set realmlist logon.warmane.com
When I log in, there are absolutely no realms to select (nothing under 'Realm Name').
Under 'Choose your language', 'Development' is checked, and I cannot uncheck it.
Under 'Choose your realm style:', I tried each of the 4 options (Normal, PVP, RP, RPPVP).

Please help, I'd like to join and start leveling for tbc.

Warmane doesn't have TBC realms. Only wotlk and MoP. If you want to play on Onyxia realm, you need wotlk 3.3.5a client.

I'm under the impression that Onyxia is using 2.4.3 client for Vanilla, and is progressing to TBC in a couple of months, is this not correct?

Its progression is currently at vanilla and will soon reach TBC but it's using wotlk client.

Thank you!, do you have the version of the client?

sorry, you mentioned 3.3.5a

thank you for the help, i'm in.