When logged in, click on the gear icon (which will ONLY be visible when logged in) in a profiles's header image. Then click on "Recommend Me".
You will immediately appear on the THEY RECOMMEND ME list of the person being recommended, and they will immediately appear on your I RECOMMEND THEM list.
You can likewise click on the RECOMMEND ME's that are associated with profile names on people's incoming and outgoing recommendations lists.
In addition to recommending people in and of themselves, one may ALSO recommend people categorically by clicking on these categories on CATEGORICAL IN tabs. The people you so recommend, and the specific categories, will appear via a link on your CATEGORICAL OUT tab.
This allows people to search within categories, by types of music, or locations, for example.
In order to set this up for yourself all you have to do is type any category you wish (you can make up your own) on your CATEGORICAL IN tab. You can look at the categories on any page to get an idea of what's already there.