1. Select Email Signatures from the left side menu of the FullContact Web App
2. Press the blue Connect Inbox button that will then redirect you to a page that requests a Google Permissions page that you have to accept or use to capture you Gmail signatures.
3. After that please wait for us to scan your Inbox and import any signatures that you might have.
After you have connected a single Inbox you can connect another one, by pressing the Connect Another Inbox button that will take you through the same steps.