Where to change login form action

Warning: noob question ;-)

I have the same problem as stated and solved here: http://drupal.org/node/246484

My login box has this form action: /user/login?destination=user
I guess it has to be changed to /user/login?destination=login_redirect and then the module will work?

But since I have never gone into the code in drupal and changed things like this I dont know where to change this code. I guess it is a specific file I need to locate this in.
I looked through /admin/build/block but there is no login box enabled there.

Any suggestions?