How do I reset the time slots that are already submitted?

I tested the jotform appointment schedule thus used a couple of times. How to I reset those times so they are available when II publish the form? 

You may delete the submissions to clear the Time slots or edit the submissions and uncheck it.

Guide: https://www.jotform.com/help/377-How-to-Delete-Form-Submission-Data

Guide: https://www.jotform.com/help/325-How-to-Edit-Submissions-Made-on-Your-Forms

Let us know if you have further questions.

Thanks.