You can upload your files directly through cPanel using the File Manager.
1: Login to cPanel.
2: Click File Manager.
3: Select Web Root and Show Hidden Files, then click Go.
4: Click Upload from the top toolbar.
5: Click Browse or some web browsers will have Choose File.
6: Select the file on your computer that you wish to upload.
7: Once the file has been selected, it will automatically upload.
Enjoy :)