First, when logging into your account you should be sure you're entering the correct username. Be sure that you are entering your username with the correct capitalization or it will not be accepted. If you created a 'Hint' for your password when you first made your account, you can have that hint sent to your e-mail address by entering your username here: https://spideroak.com/forgot_password
If you cannot find the password hint email, please double check your spam folders in case this email was incorrectly marked as junk. Always check your filter settings to make sure you're able to receive email from SpiderOak.