Log into your cPanel and Click on the Softaculous icon under Software section.
There You can see Joomla on fourth position.
If not, then Search for Joomla. This will open a screen with several options displayed. You will see a screen with Install, Overview, Features, and Import. Click on the Install link.
Fill in the installation details and click on Install.
Softaculous will check the submitted data and install the files to your server for Joomla.
Visit your website in your browser. You should see a new Joomla install.