If you’re already logged into your account you can change your password in the “My Details” section in “My Account”. This is found in the drop down menu in the top right hand corner.
You will next be asked to confirm the current password, and to enter in a new password. Once you click "Submit", the new password can be used for logging in.
Before setting up a new password we strongly advise you to check out our “How do I create a secure password?” FAQ.