Can I add a signature line that a person can sign on their ipad and I can see in the email I receive?

Do you mean to accept signature by signing on ipad in your form? If so, you may consider adding our signature widget on your JotForm so that the users should be able to sign on the form.

http://widgets.jotform.com/widget/smooth_signature

After adding the widget to your form, you may need to add the widget field to your notification from the email setup wizard. Please open the notification to edit and add the signature widget from the Form Fields on the right side to the email body content. 

Hope this information helps. Let us know if you are referring to something different. We will be happy to help.