Where can I see my replies to people who sent in forms?

If you what you mean is the outgoing messages sent to your people, unfortunately, Jotform doesn't have an outbox that stores sent messages.

If it's the submissions that you are referring to, please check this guide https://www.jotform.com/help/269-How-to-View-Form-Submissions.

Let us know if you have any questions or if you need further assistance.