My b2evolution Version: Not Entered

Hi, I am a new user to b2evo. After just installing this into my new domain name last night via fantastico, I am not able to login this morning. I received the e-mail and am using the same username and pswd that I signed up with (I wrote it down when I did it so I know it's right), but when I go to log in to my admin panel, it tells me it is the wrong login/pswd. What am I doing wrong??