Forgotten password? Never fear.
Just visit the sign-in page of your preferred app, here is the link to the web app. Below the sign-in button there is a link to change your password. It looks a little something like this, 'Forgotten your password? You can reset it.' Just click and enter you email, before long you will have an email with a password reset link.
If you ever want to update your password, visit your profile in the web app and edit it there.