This is possible and you can do it directly from your account.
Go to your My Account page, choose Name and Email you would then tick the box that says Change Password and from here you can enter a new password of your choice.
Don't worry if you are having problems we are always available to help and we can reset your password for you if required.
You can contact us 24/7 by email, chat or phone, contact details are available on our Contact Us page.