How to change "from" email address when invoicing.

How to change "from" email address when invoicing.

HELP! I'm new to Zoho Books and when I first set it up used a different email address than I currently want to use. I've tried to go to settings and change the default email address but when I generate an invoice it still shows the old email address (although I can't find it anywhere else). I really need to get this changed before I can use the program.

Any help would be appreciated.