Data access-username and password combination was invalid


I get the account confirmation email but I am unable to access the log page after following the link provided in the email. This is what I see:

Your login attempt failed because the username and password combination you provided was invalid or your user already has the maximum number of user sessions open. After 5 failed login attempts, your user account will be locked. If you believe your account is currently locked, you can:

Could you kindly instruct how to proceed?

Thank you

Han lu