On the main PNP page, click on RESOURCES, MAPS, then VOLUNTEER MAP. You'll get a full U.S. map. Zoom in, and you'll start to see where PNP volunteers are. You can display all volunteers, pilots, fosters, pilots who can foster. If you click on an icon, you get a popup with pilot details and a user name. If you click on user name, you can send a PM or email.
If you're trying to reach multiple pilots in various locations, I'd compose a blanket email in something like word, briefly explaining the transport request, including a link to the transport request post, and something along the lines of: Already have two pilots signed up to fly legs between Vidor and Memphis on 2/2. Looking for pilots and fosters to complete the transport to New Jersey.
Hope that helps.
Stephen Wade Roberts
N20223, Cessna 177B Cardinal II
Pearland (TX) Regional Airport (KLVJ)