How do I add an email signature? - Gmail
1. In the right hand corner of your email account, click on the gear and select settings.
2. Once you're in settings, scroll to the bottom until you see the section titled "Signature." Click on the image inserter (circled below) and choose your email signature file.
3. Click on the image and choose "large" so that it's the appropriate size. Scroll down to the bottom of the page and click "Save Changes." Viola!