Do you mean under Advanced Settings? I also see the “Comments xid” box as empty. This could be expected behaviour the help mentions xid is randomly generated but I guess it would be nice if it was displayed to user as well.
I did get an email when I activated the plugin but it just said: “We just thought you’d like to know that your current XID is: .” so that didn’t help much either.
I must say everything is working okay for me without knowing that xid (except for this). But I would be kind of stuffed if I ever needed that random ID to reset things.
I’m also having this problem and have requested help on the developer’s site, here http://we8u.com/2011/03/13/facebook-comments-wordpress-31-released/
