A signature is a bit of text (such as your contact information, website, or a favorite quote) that’s automatically inserted at the bottom of every message you send.
Here's how you set it up in Gmail:
1. Open Gmail.
2. Click thegear in the top right.
3. Select Settings.
4. Scroll down to the “Signature” section and enter your new signature text in the box. You can format your text using the buttons directly above the text box. New website, go!