Purchase the application "Sign Now"
Create a free account (optional)
Email and password is all you need to enter.
Press the + sign to add a document.
Import your document. I demonstrate this with email.
Go to your email message and open the attached document.
Press to open document in the "SignNow" application..
Press "open in"
Tap anywhere to add signature.
Zoom in to area and tap.
Save to your library.
Press and select options for sending
And like that, you have a signed document.
Available in the app store for iPhone and iPad.