When you first get added as an employee in your companys' account you will receive two emails. The first is just to confirm that your email address is yours and is called an email validation. After you validate your email from within your joining email, you will be sent a welcome email with your temporary password to access the system.
Click the link on the Welcome email to login and use your email address as your username and the long password shown in the welcome email to get access.
TIP: It is best to highlight the temporary password and copy and paste it into the password field when logging in for the first time.
If you can not find the welcome email you can request another by going to the login page and clicking the link 'I've forgotten my password'. This will send you another email with a temporary password.