There may be times when you want to change your account's password. You have the ability to do so by mousing over the person-and-cog icon positioned in the top right corner of the screen. This will produce the settings menu; from the head of it, click on the Change password.
Follow the instructions on the screen and click Save when ready to change your password.
If you have forgotten your password however, this can be reset by using the 'Forgotten password? Reset it via email' link on the login form.