- Copy the vendors public key into 'gedit Text Editor' - Save the file to your desktop and then double click it and it will import their key into OpenPGP. - Open gedit up again and then type in your address - Highlight the text and go to 'Edit' then 'Encrypt' then tick the box next to the vendors PGP key and click OK - Now you'll see a PGP message in gedit, copy this message and paste it into the address field.