How do I send my key to someone?

If the recipient isn't using encryption yet, then ask them to install GoodCrypto, exchange messages with them until you both receive email letting you know future communication will be private. That's it. GoodCrypto automatically exchanges keys for both of you unless your administrator configured GoodCrypto not to exchange keys.

If the other person isn't using GoodCrypto or your aren't using the auto-exchange featuren, then you can still exchange keys manually. Export your key and email the file to them. Ask them to send you their key, and then import it.