If you have any problems with no search sites showing up, please delete your preferences file. Quit jSearch, then go to your home directory, then Library, then Preferences and delete com.thomason.jsearch.plist. Then re-launch the program and you'll be fine.

Also, please note that the initial software launch can take a few moments as it is trying to cache the favicons from the various search sites. Depending upon the speed of your connection, this may take a while. Subsequent launches will be instantaneous, since it will have the icons cached.