To setup forwarding with Ion, click on this link and scroll to the bottom of the page. Enter your Webmail password and the email you want to forward to, NOT your TJ email. Your username will automatically be filled out for you.
You should get a popup that looks like the one below:
You should now test your new filter by sending a test email to yourself. If your filter is working correctly, you should receive a copy of your test message in the inbox of the account you specified above.