I know you can use the memo section with "#" to encrypt a message when sending hive, but how do I read them?

Are you using Peakd or Hive Blog?

Sending encrypted messages on peakd+Hive is not very user friendly. Please consider using my website instead.

First, you login with your POSTING key so that a "Message" option will appear.

When you click on "Message" the website will then ask you for your MEMO Key. Once your fully authenticated, you'll then be presented with a textbox.

ps. Do I know you?