If you don't want to use a 3rd party FTP Software, you can use the cPanel's inbuilt File Manager.
- Log into your cPanel account.
- In the "Files" section, click on the "File Manger" Icon.
- cPanel File Manager will be open.
- Navigate to the directory where you want to upload your files. For example, should you wish to upload your file to the public HTML folder, you need to go to /public_html first.
On the left side, you can see a list of directories. Double Click on the "public_html" folder. - Now click on the "Upload" icon.
- Click on the "Select File" button and select the file you want to upload from your PC. After you have selected the file, the upload process will begin automatically.