There may be times when you want to change your account's password. You can do this by clicking on the person-and-cog icon positioned in the bottom left corner of the screen.
This will produce the settings menu. From the top of it, click on Change password.
'Change password' tab
Follow the instructions on the screen and click Save when ready to change your password.
However, if it's the case that you've forgotten your password, you can reset it by using the 'Forgotten password? Reset it via email' link on the login form.