Click on the Projects tab in the navigation bar at the top of your screen.
If the Project you'd like to edit is an active Project, it should populate on this page. If the project you'd like to edit is either Archived or Cancelled, you'll need to click the (Archived / Cancelled Projects) link in the upper left. You can then toggle back to the active Projects by clicking back on (Active Projects) link.
Note that you can use the search option in the upper left or the filter option in the upper right to easily find the project you're looking for.
Once you find the Project you'd like to adjust, click View Project.
This new page will have an Edit button in the upper right, click here to edit this Project.
Once the adjustment(s) have been made, click the Update Project button at the bottom of your screen.