The default email signature on the iPad says, "Sent from my iPad". It finds that to be a little boastful. To remove the Apple marketing and become like a real person, go into Settings and tap on Mail, Contacts, Calendars. Find Signature in the fourth section down. Type whatever you wish.
Some people will leave the phrase and add something like "so forgive the brevity of this message". I personally just use my name and web address.
"iPad Tips and Tricks : Change your Default Email Signature "
Reference : top-ipad-video-converter.com