How do you add the: "places mentioned"
When you're ready to add a post about a "place," hit reply as you normally would in a thread to bring up the reply window. At that point, you should see a link in the lower left hand corner that says "Link to a place BETA". Click on that to bring up a "search." Type in the name of the place (e.,g Restaurant X), then the location( City and State) and click on "search." That should hopefully bring up the name and address of the restaurant. Click in the radio dial button next to the restaurant, then go ahead and type your post, then click the orange "post my reply" button.
If you're nervous about this, then I suggest adding the link to the place first, hitting "post my reply," then using the "edit" feature to add the text of your post.