you have to check how redirect is configured.
it could be through .htaccess file or through index.php file [in public_html folder]
wherever you have the redirect configuration, you can replace mybb with forum
Thank you for fast reply. Do I need to change this code in index of my theme?
<title>{$mybb->settings['bbname']}</title>
to
<title>{$forum->settings['bbname']}</title>
^ No need to change such codes which have $mybb
Hello! I fix problem. I'm hostinig my websitie with xammp and there in htdocs folder i have a file index i change there header('Location: '.$uri.'/mybb/');
to header('Location: '.$uri.'/forum/');
and everything works

Thank you again for support
