You can select to 'be remembered' and thus avoid having to log on manually each time you enter the ICHC member site. The way this works is that your details are written into a 'cookie-file' on your computer. When you log on in the future your details are automatically retrieved and checked. If you log on from another computer you will naturally be requested to enter your password.
The reason you should not select this option if you log on from a public computer such as a library or Internet cafe is that if somebody else goes to the ICHC website they will automatically log on in your name. The computer has no idea who the user is and sends the information contained in the cookie regardless.