Note: For another way to manage web hosting files, also see: FTP in cPanel
First, login to cPanel in a web browser (Knowledgebase article: Login to cPanel)
In cPanel, to find the "File Manager", scroll to it on the main cPanel page, or use the cPanel search function to search for "File Manager". Clicking on the "File Manager" link will open the files in a new browser window.
The primary domain's website is housed in the "public_html" folder .
Files for addon domains on the website hosting will be located in folders with the actual domain name, or whichever folder you set as the "document root" of the domain when you created the addon domain. (See HelpDesk article: Add Domain in cPanel)
In the file manager, you can open folders to view files, move or copy files, download, upload, rename, edit, compress, change permissions, delete files, and also create new files and folders. Select a file or folder and use the top action menu to select an action, or right-click a file or folder to bring up an action menu.
Note: For more information on how to move or copy files in the cPanel file manager, see the article: Move or Copy Files in cPanel
Note: You can directly edit text files and HTML files in the cPanel file manager. See the article: Edit Text Files and HTML Files in cPanel
Note: You can only download individual files in the cPanel file manager. You cannot download entire folders. For downloading more than individual files at one time, you can connect to FTP (HelpDesk article: FTP in cPanel), or you can run a backup (HelpDesk article: Manually Backup Web Hosting Content in cPanel).
Note: For documentation directly from cPanel about the cPanel File Manager features, go here: https://docs.cpanel.net/cpanel/files/file-manager/