Deleting a submission

I accidentally submitted one extra form to our jotform than I meant to (it was a duplicate). Is there a way to remove it. 

Yes, you can easily delete a form submission in the Submissions page. Please check this user guide: https://www.jotform.com/help/377-How-to-Delete-Form-Submission-Data.

Hope that helps. If you have any questions, let us know. Thank you.