How to find a public key?
You can find the public key of someone else by sending him an email asking him to send you his/her public key. Or you can search a public key server for a key. To do that, choose “Search…” from the “Keyserver” menu and type the name of the person you want to find the public key. It is highly recommended to verify that this key belongs the right person. The easiest way to do that is to ask the key id of the key by phone.