Once you are logged in to the website you will be taken to your dashboard. From there you will want to click on the "my account" option in the upper right of the page.
This will take you to your "Account Information" page where you will click on the "Change My Password" option.
This will cause a window to appear where you will enter what you would like your new password to be and re-enter it in the "Confirm Password" field. Then click "Change Password".
Next time you log into the website you will need to enter your email address and your new password.