Welcome to that database.
You can go into your collection and follow the link for Match cards from your want list to peoples cards for sale or trade. Another perhaps quicker way to find things is on each individual cards page under the photo there a link to the number "mentions in collections" this will list members who have the card listed in their collections, wantlists, or for sale/trade lists.
I collect: Baseball, Football, Hockey, Mostly Vintage pre1980, My Homie teams - Washington/Baltimore Teams Senators (Twins, Rangers), Expos/Nationals, Redskins, Capitals, Bullets/Wizards - HOFers - Non-sport (mostly TV shows and movies).
My Trade List is very much a work in progress
CaptKirk42s Trading Card Blog Curly W Cards Strive For '65 YouTube klandersen42