Redirecting devise after login

hi,

   i am using devise gem in my app for authentication. if i enter

   link1 -> http://localhost:3000/users/sign_in,

   once i login, it will be redirected to

   link2 -> http://localhost:3000/user/dashboard.

   if i can add new posts or comments for that user using this link

   link3 ->
   http://localhost:3000/community_managers/posts/new/2/Facebook

   lets say i am using firebox.

   If i copy that link3 and try it out in some other browser.

   it will ask for sign_in .

   if i sign_in with proper credentials, i have to redirect the link to
link2 , but it is redirected to link3

  thanks in advance.