Signature at Thunderbird

Do you need actual help of where to set up the signature file? Or are you having problems using it? Signatures are set up for each mail account, so you'll find them under tools->account settings->select your mail account. However, I believe there are some portability issues if you use an external file for the signature.

If you're having problems with your signature file not being used when you move from computer to computer then take a look at this:
http://mozext.achimonline.de/signatureswitch_directory_variables.php