If you want to reset your password, go to the menu and click on 'Login'. On this page you will see the option 'I forgot my password'. When you click on this you will go to the Forgot Password page. Enter your email address here and click 'Reset Password'. You will receive an email to confirm the reset of your password. After confirming, you will receive a new password value by mail with which you can login.
If you want to change your password afterwards, go to the 'Menu', click on 'Settings' and click on 'Password'. Here you can set your own password.