Форумы / Cotonti / Support / comments for plugin

i trie to add comments for a plugin but i'm getting this message: Adding comments has been disabled for this item
i added this to the plugin

list($comments_link, $comments_display, $comments_count) = sed_build_comments($item_code, $row1, $comments);

$t->assign(array(
"COMMENTS" => $comments_link,
"COMMENTS_DISPLAY" => $comments_display,
"COMMENTS_COUNT" => $comments_count,
));