If shaking your iPad does not show you the undo message please make sure that Shake to Undo is enabled on your iPad.To enable Shake to UndoLaunch the Settings app on your iPadSearch for Shake to UndoOpen that settings section and turn it onRelated ArticlesHow do I add my email signature to Windows 10 MailHow to install your email signature in Outlook 365 for iOSHow do I add a signature to Apple Mail on iOS?How do I add a email signature to Gmail Mail ?Signature images not showing in Apple Mail