If You want that Your users will get redirected to the forum home and not to profile page then follow my simple tutorial, please.
To edit the following file use a code Editor like Notepad++ or Sublimem both are free):
Go to line number 161 and replace the default code - this one*:
window.location.href = codo_defs.url + 'user/profile';
- with that one:
window.location.href = codo_defs.url;
- Now save, upload the file, recache browser and it should do the trick.
P.S.: If You are using a other Codoforum theme, make sure to check if there is a login.tpl included (if not then all is fine). If yes then do the same with that template, please.