Thank you for reaching out to the community!
Constant Contact requires that you log in to your account each time to be sure that the appropriate individuals are accessing your account. This is the same idea as your bank website or personal email address. Since Constant Contact houses intellectual property we need to make sure that this information is secure, therefore, we make sure that all accounts are accessed by using a username and password combination. I hope that this helps clear things up.
Please let us know if there is anything else we can do for you.