How to add an automatic Reply

I would also like to know how to add an automatic reply to the people who sign up using the jotform. Please advise.

press the email envelope icon at the top bar,

you will get a drop down containing "notification"

ignore that and press "Add New Email"

 

This will give you the option to add an "Autoresponder" email, the defaults will work, but you can configure all sorts of options here

As @paulmanton said you need to add Auroresponder Email. For more information, please take a look at this article:

http://www.jotform.com/help/26-Creating-a-Form-Autoresponder 

If you need further assistance, please let us know.