Quote from Asgaros on July 21, 2018, 2:48 pm

Probiere es mal hiermit:

add_action('asgarosforum_custom_profile_menu', 'my_profile_menu');
function my_profile_menu() {
    global $asgarosforum;
    echo '<a href="https://www.meineDOMAIN.de/nachrichten/?fepaction=newmessage&fep_to='.$asgarosforum->current_element.'" title="'.__('Private Nachricht','rcl-asgaros').'">Nachricht senden</a>';
}