[@nesdam1981 Participant 6 hours, 27 minutes ago]

I got the editor and this plugin to work by adding a code to my themes functions.php (child theme if you use that)

function bbp_enable_visual_editor( $args = array() ) {
    $args['tinymce'] = true;
    $args['teeny'] = false;
    return $args;
}
add_filter( 'bbp_after_get_the_content_parse_args', 'bbp_enable_visual_editor' );

It activates the TinyMCE editor in BBPress.