Were you ever able to find an answer o this?
you need to add the query string
?_action=postlink
to the odl page e.g.
yourdomain/odlink/?_action=postlink
(assuming you have permalinks on, and using the default slug.
You can then add a custom menu item with a url
/odlink/?_action=postlink
name name it ‘submit URL’ or link to it in your page – whatever you want.
It works fine, just difficult to work out …. see, for a hopefully working example
http://directoriesdirectory.com/directory/?_action=postlink
Same issue for me: I can successfully submit sites, I get the message “Your URL was sucessfully submitted for editor review!”
I also receive the e-mail with all the information entered, but I don’t see the sites in the admin section, so there’s no way to approve them.