Editing submissions – No save/submit button?

I have edited a submission but can't find a button to save it. What gives?

To SAVE the Edited submissions , use the Submit button of the Form. 

When in Edit Mode, it simulates the process similar to when filling up the form in actual. So the submissions will change/update once you submit the form.

Just submit again the form, and it should change/update the changes done.

Hope this is clear. Let us know if you need further assistance.

Will this resend the emails connected to this form?

Yes, it will resend the email notifications associated with the form. 

If you have setup an autoresponder, by default it will not send it when you edit the submission (and re-submit) it, but you have an option to send it by enabling the check box "send on editing submission".

You can also conditionally trigger notifications/autoresponder, here's a guide that you can follow: http://www.jotform.com/help/167-How-to-send-to-a-specific-email-address-based-on-a-selection. It edit mode, the conditions should also work as expected. 

Let us know if that helps.