Redirect refering page after login and template the profile page in wordpress

Hi I’m having a wordpress site(still offline) which is basically a news paper site. Users has to registered to comment. My problem is that when users login for commenting on any article, they are redirected to profile page (or to home page if i use some plugins)… but the standard should be redirecting them to the referring page as to comment on that was the reason they logged in. What is the solution for this?

And another thing is the user profile, my site actually don’t need a user profile but need option to change the password. By default the profile is same like the wp dashboard, how do i template it? Is it author.php file that i have to work on?