How do I encrypt an email in Mail?

I've searched all over the internet and I already have my free certificate installed from Comodo.com. I open Mail but the secure/encrtion buttons when making a new mail message do not appear like they should. Help!

Hello Säckingen,
It's quite easy, but needs a few steps.
1st a question. Do you principally know how PGP, that is, public key cryptography works? Otherwise I'll have to write you a little explanation.
If you do know, then you know you will have to have a personal key. You can create one by going to the application GPG Keychain Access. So create your keys.
If you want to send an encrypted mail to somebody than his/her public key has to be in your keychain. Most of the people that use PGP/GPG have their public key posted at the Internet, at one of the key servers, you can find them with google.
Imagine you go searching for my public key. Imagine you found it. Then you can add it to your GPG Keychain.
Then you can send a mail to me.
Start mail
Begin creating a mail to me. Just next to the line with from: <your mail> and Signature there is a little sign with a lock, click the lock, in the upper corner of the mail the "Open PGP" will turn green and the lock will close.
Type your message + send.
The mail will automatically be encrypted.
The other way around, if someone sends an encrypted mail to you, then he/she will need your public key (NEVER send your private key to anybody), you can post the key on a key server or send it as an attachment to your contact. If an encrypted mail arrives with you, the mail will present you with a request to enter your password/pass phrase, and the mail will be decrypted.

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How do I encrypt an email in Mail?

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