Allow individual access to edit all submissions for a form

Hello. I'm guessing the answer to this is 'no', but is there any way to allow a specific user access to the "edit all submissions" functionality for a particular form, without having to give them my username and password?

Many thanks

Yes it is possible to achieve your requirement by adding a sub-user account and sharing desired form. You can share your forms with another user to view / edit forms or submissions. This type of users are to assist you in your work. 

You may like to take a look at the following guide which should help you:  http://www.jotform.com/help/232-How-to-Share-Forms-with-a-Sub-Account-User

Do try it out and get back to us if you have any questions. 

Great - will give it a go. Thanks very much.