wowowowo, all done!!!
use the “forum tool”, the first option, and perfectly done!!
Thanks Stephen, i tried it out but not work. In the meantime, i find another problem. In my WordPress Administration Screens navigate to Reply > all the reply, it should be a list of all reply, but actually this page doesn’t exist, it turn back 404 error. I don’t kown how to fix it. And i guess maybe there would be some connection between these two problem.
http://www.maldiveschina.com/wp-admin/edit.php?post_type=reply