Login Redirect?

Hi SI Team

I am not sure what it is called.
But please tell me where I can find the redirect on login here:
http://www.finalbug.net/network
I am referring to the big register/login box up at the top of the page.
I want users who login to be redirected to the following page:

http://www.finalbug.net/groups/my-groups

thanks

Paul