Adding An Email & Text Message Signature
Email templates can be used to create a signature for your outgoing emails and text messages...
To create a signature, go to the Settings tab and select Email Templates. Then click the "add new" link to get to the following screen.
Further information on how to create a template using the email template editor can be found here: Creating Email Templates
When sending an email or sending a text message, you can then select the template you've created and your message will be ready to compose with your signature displaying at the bottom of the message.