download GPA and then click create new key. Name your key something random and make up a not real email for it (it literally has nothing to do with the process it just shows under your name). Make a good password. Now go to market of choosing and pull up GPA. Right click on your name and select copy key. It automatically copies your public key to your computers clipboard. slide back over to your market and find the account settings for PGP, it should have a place for your to paste your Public Key. This allows people to encrypt message to you that only you open. Okay now you need the public key of the person you want to contact. Look on their profile for that and highlight it and press copy. Now heres where it gets somewhat complicated. Open notepad and paste there key in. it has to be a .txt file. Save the key somewhere where it is easy to find. Go to GPA and click import keys. Find the key you saved and import it. Now you are ready to make a message. Open the clipboard on GPA and type message in. Now push Encrypt. It will ask you with whose keys you want to encrypt the message and with what keys you want to sign it. Select the person you want to send the message to then select yourself to sign. It will now ask for your password enter it. Now your message has been converted into a mass of random alphanumerical digits. Copy this making sure to include everything but no extra space at the bottom. Paste into message and send.