You should have received an email invitation for your new Teamwork account.
Username: Your username will be the email address to which the invitation was sent.
Password: A randomly generated password will be included in your welcome email. The first time you log in, you will be asked to change your password. Please make sure to retain this password for your records. If you forget your password, use the link included on the login screen to request a new one. You can also request a new email invitation be sent by contacting your Project Manager via email.