How do I put information into my contract that needs to change with each person? For example-time/date/location of appointment?

Hi,

How do I put information into my contract that needs to change with each person? For example-time/date/location of appointment?

thanks

You could add fields to the form to display that data, set those fields to read only and populate the fields using URL parameters:

https://www.jotform.com/help/71-Prepopulating-Fields-to-Your-JotForm-via-URL-Parameters

Send the user the specific URL with the data already populated.