For any member who's logged their Wants, you can simply click on their ID and down toward the bottom of their Profile page you'll see various Matches available to what you have logged. If you have nothing logged on your Trade/Sale List, then you will not see anything matching. Then you simply have to go to that person's Collection and find their Wants from there.
Follow my blog - I Identify as a Card Collector.
“Aslan didn't tell Pole what would happen. He only told her what to do. That fellow will be the death of us once he's up, I shouldn't wonder. But that doesn't let us off following the signs.” - Puddleglum in The Silver Chair by C. S. Lewis