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I'm not sure if I understood your concern correctly. Did you meant by adding new rows, adding new responses? If that is the case, you can add new submissions in JotForm by viewing the form and filling it out.
But if you are looking on adding new submissions in a form directly, I believe we do not have that option, you can view your submissions by following this guide: http://www.jotform.com/help/269-How-to-view-Submissions. You can see various options on what you can do like downloading of submissions, editing them, deleting multiples, forwarding them, and many more.
If I misunderstood your question please do provide us more details of it.
This is frustrating... I add entries to existing forms all the time in Adobe.. Can this be an enhancement?
When it comes to adding new rows, it's simpler to preview the form, fill it out and submit, because each row represents a single submission.
Now, if you wan to add a field (which will be a column in the submission page) to an existing submission and manually enter data, this is possible, Example:
Let's say your form is currently build with only two fields:
And you have already received submissions:
Then you realize that you need the phone numbers of your clients, they provide it to you, and you need them to bee part of the already received data through your form.
1) Go back to the edit mode of your form, and add the desire field:
2) Go back to the Submissions page, and click on Edit to add the data:
Let us know if you have more question, we will be glad to assist you.