What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Unfortunately, we do not have a function or feature that allows you to directly edit your submissions on a grid list. Currently, the reports submission like "HTML Table Listing Report" and "Grid List Report" are ways to display your submissions, it can be private or public.
Here's a guide on how to edit your submissions: http://www.jotform.com/help/325-How-to-Edit-Submissions-Made-on-Your-Forms.
In the grid list in your Submissions page, however, you can directly delete the items by clicking the delete button or icon.
I hope that helps.