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/** ==================================================
 * Filter of Fixed Bottom Menu
 *
 * fbm_column
 * @param int $column  column.
 */
function fixed_bottom_menu_column( $column ) {

	if ( 102 === get_the_ID() || 104 === get_the_ID() ) {
		$column = 6;
	}
	return $column;

}
add_filter( 'fbm_column', 'fixed_bottom_menu_column', 10, 1 );

/** ==================================================
 * Filter of Fixed Bottom Menu
 *
 * fbm_column_value_
 * @param array $column_value  column_value.
 */
function fixed_bottom_menu_column_value_6( $column_value ) {

	if ( 102 === get_the_ID() ) {
		$column_value['url'] = 'https://fbm.riverforest-wp.info/';
		$column_value['icon'] = 'admin-home';
		$column_value['text'] = 'Home';
	}
	if ( 104 === get_the_ID() ) {
		$column_value['url'] = 'https://fbm.riverforest-wp.info/ja/fixed-bottom-menu-%e3%83%a9%e3%82%a4%e3%83%96/';
		$column_value['icon'] = 'admin-home';
		$column_value['text'] = 'Home';
	}
	return $column_value;

}
add_filter( 'fbm_column_value_6', 'fixed_bottom_menu_column_value_6', 10, 1 );

Add a sixth column, specifying a submission ID and a column, and then add a sixth column, specifying a submission ID.