Hi Eugine22,
The Blue server no longer exists; instead, we now have the Gold server (formerly Yellow) and the Silver server (formerly Red and Blue, merged into one). This account you are posting on appears to have not existed before the merge, therefore, you should be able to log into Gold and Silver without any complications. Do you have the latest client downloaded? You can download the latest client at our Downloads page. If applicable, be sure that you've completely deleted all previous clients before downloading the latest client.
If you are certain that you have the latest client downloaded, have you gone ahead and verified your e-mail yet? You will need to do so in order to log into the game. In some cases, logging into the Dashboard can force an activation, allowing you to log into the game anyway.
If none of this helps, please let me know and respond with what message you're receiving when trying to log into the game; I'll do my best to troubleshoot your issue from there!
Kind Regards, Astraea.