Completing the final step of the workflow submits your response. The request is then marked complete and moves to Requests > Completed requests, and the button at the top of the workflow reads Task completed.
At that point the details can no longer be edited.
If you need an RFP reopened — to correct pricing, swap a unit, or add inventory you missed — contact your Account Manager. They can reopen the request so you can make changes and resubmit.