Signature

Signature

When i go into invoice, select an invoice, send the invoice via email a default message and a signature we created is already filled in, in the body of the email. I figured it was the "signature" feature under settings. 

I went to Signature and changed it, saved it then tested it out again by sending an invoice  but nothing was changed. 

Is there another area i have to make these changes. I have tried to google and looked through the site but I'm lost! Help zoho! :)