Once you have your login information, go to the front page of the site and proceed to log in.
Your login (also known as a session) will expire after a certain period of inactivity, which is usually around 20 minutes. The system will warn you a few minutes before the expiration. This is done for security purposes. If this happens, you can always log in again. Once you are done using the system, it is better to fully log out, to prevent any problems that may arise if someone uses your computer before the session expires. This is especially important if you are using a public computer in a lab.