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Stay signedin?
##

use strict;
use WWW::Mechanize;
use HTTP::Cookies;
use LWP;

my $user = 'name'; 
my $pass = 'xx123xx';

my $url = "http://www.forum.com";
my $mech = WWW::Mechanize->new();
$mech->cookie_jar(HTTP::Cookies->new());

$mech->get($url);
$mech->form_name("signin_form");
$mech->field('Username' => $user);
$mech->field('Password' => $pass);
$mech->submit();