Problems with jpeg email signature

Good morning,

I need to set an email signature. Could you please let me know how to set a jpeg one, or if I should convert it to any other format ?

If you could give me the steps to do that, it would be greatly appreciated.

Thanks.

Please see the Documentation (F1)

Or directly here.

While you are creating signatures, you might also want to look at mail templates (Settings, Mail, Templates and Signatures). You can create standard messages and set some of them as defaults. Click on Mail Templates to create them. I use this all the time when contacting interview subjects, approaching sources, etc.