You can log in to view your quote at any time. Once you've submitted a quote, you'll notice a new Quote tab appear when inside the quote next to the Header tab and Attachments tab (if attachments were included by the buyer). You can confirm that your quote has been submitted by looking at the Published Date on the Header tab. You will also be able to view your quote submission and any attachments that you included.
You can update the quote using the Edit Quote option within the More Actions menu. You are able to edit your quote up until the response date or until the buyer checks out your submitted quote (whichever occurs first).