In case you forget your password or want to reset your password, you can use the 'Can't access my account?' link on the login page. You will then be asked to enter your email ID. Once you do that, an email will be sent to you with the password reset link.
If the email did not reach you - Check your spam folder or contact your email administrator - If you have one.
You could also change your password from inside the app, once you login. Click on My Account on the top left, Personal info on the left and then on "Change password", like this: