Hi Andrew,
For some reason the information inside the optional information is not appearing unless I edited your question here.
Back to your issue, it seems like you did not set any tag inside your quickpost hence the related post will not appear. Try to create a new quickpost and then click on "More Options" button as you can see from my screenshot here in order to add tag,
http://screencast.com/t/hGoqHljPxj .
Hope these help.