You can change your password as often as you wish. To do so, click on your profile name, which displays in the top-right corner of the screen. This will display a small drop-down menu. One of the options is "Change Password".

In order to create a new password, you first need to confirm your existing password. You will then be asked to add the new password twice.

All passwords must be at least 8 characters in length and contain at least one number and one upper case letter. The password must also be sufficiently different from the one used previously.