Log in to your account by entering your username and password in the Login for Member Benefits under the Login | Register in the main menu. Once you are logged in, click on the Your User Profile under Login | Register in the main menu.

You can now change account details and password.

Click on the Update button before exiting this screen.

Note: Leave the Password and Verify Password rows blank unless you wish to actually change your password. Those rows are typically blank for security reasons.