[Link14716]

Firstly, just add this:

PHP Code:

if ($bbuserinfo['userid']!=0) {
  $username=$bbuserinfo['username'];
  eval("\$logincode = \"".gettemplate('forumhome_logoutcode')."\";");
} else {
  eval("\$logincode = \"".gettemplate('forumhome_logincode')."\";");
} 


Also, make sure it appears before the header template is called and after functions.php, sessions.php, etc. are required.