How do I attach a JPEG email signature?

How do I attach a JPEG email signature?

Hi guys,

I have had a custom email signature made up by a third party (in the JPEG format), and I want to attach it to the bottom of my outgoing emails. But for the life of me I can't figure out how to do it in Zoho - does anyone have any simple instructions for attaching a graphic as a digital email signature in Zoho, please?

Thanks a lot!