Q: How do I add a signature to my emails in Thunderbird?

Answer

You can create a signature file in Wordpad or Word and save this to your desktop or other folder. Then open Thunderbird.

1. Go to Tools > Account settings.
2. Click on the Choose button in the Attach this signature section and browse to the desktop or other folder where you saved the signature file.
3. Choose this file and click OK to close the Tools window.

Result: This signature will be added to your outgoing emails.