How to use file manager in cPanel?
Step 1: Login to the control panel
Step 2: Under Files, select File Manager
Step 3: Click Go.
In the resulting page there will be 2 portions, left tree and right display portion.
Step 4: Select public_html from the left tree, this will display the files under the folder public_html in the right area.
"public_html" is the main folder under which you have to upload all the files and folders.