Hi,
Some web hosting companies provide tool name "fantastico".
It has option to install prestashop. In your current CPanel/WHM I can not see prestashop install option.
To add prestashop you need to contact customer support team of web hosting company because they manage cPanel/WHM automatic software installation feature.
PrestaShop Tutorials Videos [How to do Tasks]
https://www.prestashop.com/forums/topic/907438-prestashop-tutorials-videos-how-to-do-tasks/