Sleica-
Sorry to hear you are having troubles. I just set up a "dummy" account to see if I had problems logging in and I did not. I also tried resetting a password and it worked. I was hoping I could duplicate your problems so I could tell you exactly what to do differently.
Questions for you: Our passwords are case sensitive... maybe check to make sure your keying it same way your registered? What browser are you using? Did you try logging in using a different browser?
You can either answer here or email me so we can get to the bottom of this: This email address is being protected from spambots. You need JavaScript enabled to view it.