http://wikipewt4n75trifcse2ggaieot27svognl7idu6xmmqn37kf64rvsyd.onion/index.php/Verifying_PGP_signatures
When the Configure window comes up, go to the Directory Services section. You should see “hkp://keys.gnupg.net” listed with the scheme “hkp” and the “OpenGPG” box checked. Click OK. With the main window in focus, click the Lookup Certificates on Server button (with a picture of binoculars), or select it from the File menu.