You can easily change your password from your desktop or mobile device. First, locate and tap the blue "My Account" button at the top right of the screen. (You must be logged in to see this.)
On the next screen that appears, tap the blue “Change Password” option below your name and email fields. You will be asked to fill in your current password, a new password and a confirmation of your new password to ensure you entered it correctly. After completing these steps, tap "Save changes."