I'm sorry that you are having trouble accessing your account. We know that the account security is a very serious matter; for that reason, we have security policies in place to make sure that only authorized personnel gain access to your account. Due to these policies, we can only provide a limited amount of assistance to you through public forums. You may be using the wrong username or password.
Here are some links that might assist you with gaining access to your Constant Contact account.
Direct Login Page: https://login.constantcontact.com/login/?cc=sm_COM_ctcthelp
Recover Username: https://login.constantcontact.com/login/unrecover.sdo?cc=sm_COM_ctcthelp
For the fastest resolution of your support request, please call us directly at 1-866-289-2101 (US) and we'll find a solution. Here are the days we're available:
Monday - Thursday: 7:00 AM to 11:00 PM ET
Friday: 7:00 AM to 9:00 PM ET