Set-up an email signature to use in emails sent to Contacts in the CRM.
Click the Settings link, which appears in the upper right corner of the page.
The Signature admin allows you to create and edit signatures for the CRM emails.
Use the form to add a Name and Signature
You can set up multiple email signatures. Check "Is Default Signature" to make that signature available in the CRM email.
In the CRM / Contacts admin, click on an email value.
The Send Email modal opens, showing the send and email interface Your signature gets applied to the bottom of the message.