Redirect not working

Hey –

Am using the login page – section 2 – where you can set the language of what is displayed after a person logs in. It says you can either leave the default, change the text OR you can enter a link below and it will redirect. I am trying to redirect back to my forums page rather than giving a message – but it isn’t working. The option to change the text does however work. Thanks for any help you can offer.
Best,
Rochelle

The page I need help with: [log in to see the link]