To create an email signature that will automatically show up on the bottom of your emails when composing a message:
- Open the email compose window by clicking to email an individual or group.
- Make the content of your email your signature.
- In the toolbar, click the "..." icon and then "More" and select "Set as Email Signature."
Once complete, when composing emails in the future you'll see your signature automatically appended to the end of the email.