J.S.
An electronic signature is someone's actual signature, scanned in as a saved signature "document" that you can access through your word processing program.
He wants you to hit "add signature" on the computer program and add his signature.
______________________
/s/ is the normally accepted stand in for a signature. I think it stands for "signed" and then you type your name.
We just have the computer room add them - so I'd suggest going to Kinko's or somesuch. You want a scanner to scan it in, and they can do that, and email it to you. But no - there's no "Mouse" made signature, sorry.