log-in redirect... WHAT?

Im trying to use the login and out redirect plugin, (2).

The directions at install.txt is as follows...
Plugin Name: Login Redirect
Author: Andrew Billits

Files:
----------------------------------------------------------------------
login-redirect.php - goes in /wp-content/mu-plugins

Instructions:
----------------------------------------------------------------------
1) Place the files in the specified directories
2) Edit the config section at the top of login-redirect.php

So i go to login-redirect and it looks like...

*/

//------------------------------------------------------------------------//
//---Config---------------------------------------------------------------//
//------------------------------------------------------------------------//

$login_redirect_url = 'http://domain.tld'; // the url you want users to be redirected too after logging in

//------------------------------------------------------------------------//
//---Hook-----------------------------------------------------------------//
//------------------------------------------------------------------------//
add_action('login_head', 'login_redirect_to', 1);
add_filter('wp_redirect', 'login_redirect');
//------------------------------------------------------------------------//
//---Functions------------------------------------------------------------//
//------------------------------------------------------------------------//

function login_redirect($location){
global $login_redirect_url;
if ( $location == 'login-redirect' ) {
$location = $login_redirect_url;
}
return $location;
}

If i was using regular wp, i'd just type in the url. But how do i set it so that individual users checking into their OWN blogs automatically end up at their POST page?

Plus, how do i create a "login-log out" site-admin button on themes without them?

Or is instructing users to add a widget my best option.

AND, (sorry about this) is their a widget that won't under-mine my attempts to REbrand site, by offering links to wp?

Thanks guys in advance as usual.