Menu > Preferences > Account Settings > Signature text > (tick "Use HTML" box) > (paste the HTML below into the box) > Ok
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You should now test to see if your Privyseal is properly installed by composing a new email and seeing if your Privyseal is pulled into your new email with the current date and time. If it is properly installed, your Privyseal should always reflect the current date and time, as your Privyseal's details are checked regularly each day.
(If your Privyseal disappears you should check to see what the problem may be by logging into www.privyseal.com or by making enquiry with the relevant qualification authority. Your Privyseal serves as an easy way to tell that everything is in order, or that there is a problem you may need to attend to.)