First, you will need to go to
http://pirax.net/secret/. Once you are there, you will see the following page:
Click on "Encrypt".
You will now see a page that looks like this:
In the field labeled "Secret Key", you will type in the master key for your encryption. You will need this key to be able to decrypt your crypted message.
In the field labeled "Secret Phrase", you will type in the word or words you want to encrypt.
It should look something like this:
In my example, I used "scarygoblins" as my key and 'PASSWORD" as the word I want to encrypt. After you have done this, simply click "Submit" or "Go" or whatever it says. It will then show you your encryption. It should look something like this:
Now all you have to do is copy and paste the Encrypted Phrase and give it to someone who knows the master key.