First, in cPanel, create a database, a user and give that user all privileges to your database. Remember the name of the database, as well as the username and password. Next, upload the complete Joomla archive in the public_html directory, and extract it there using the cPanel file manager. Navigate to your website home page and you should be presented with the installer. Follow the instructions and at the database section, enter the information for the database and user you created just before. Your installation is now complete.