i want to add a sig on my pro?
Huh? "on my pro?" Are you referring to your MacBook Pro? If so, initiate the mail app on your MacBook Pro, select Mail and then Preferences. After that, select Signature and then create the signature you want. If you're referring to adding a signature to your iPhone or iPad, simply go to Settings/Mail, Contacts, Calendars and then scroll down to Signature. Tap on Signature and then create one. If neither of the two is what you're looking for, please respond and be a bit more specific, please. Take care.