In order to Edit/ Upgrade project or Extend the bidding time, please follow steps below: 
** Note:
Extending a project only takes effect if extending request is submitted within your current bidding time.
When the bidding time expires, the link to re-open project will be enabled and you can list your project open again to attract more bids.
Editing the project is permited only before the Buyer selects a Freelancer for the project.
You could edit project tittle and project description if no bid has been placed
You could only add more information to project description if bids has been placed