1) Login to cPanel and click on File Manager
2) Double click on the target path whereby the file is located e.g. /public_html
3) Click once on the target filename e.g. affsignup2.png and click on the "Copy" button.
4) A new pop up will appear that prompts you for the target location where you wish to place the copied file e.g. affsignup2.png
In this example, I'll enter "/public_html/tutorial/" as shown in the screenshot below.
Press the Copy File(s) button to confirm the copy.