After logging in, hover over the gear icon in the top right corner of your browser and click My Account.
Next to 'Account Details' click the 'Update' button.
Enter your current password, then enter your new password twice in the appropriate fields. Passwords must be a minimum of 8 characters and include at least one lowercase letter (a-z), one uppercase letter (A-Z), one number (0-9) and one special character (#,@,$,%. etc.).
Click 'Update' to save your changes.