To change the name of a file, link, or folder you have entered into the Files section of a project, click on the row for that folder / file / link. Once the row is highlighted, the sidebar will appear on the right. From the Details tab in the sidebar, simply click on the name under the details section, add the new name for the file or link, and hit enter. You can rename any files or links from here. You can also change the URL for links by clicking on the link in the sidebar.