1. Log into your cPanel.
2. Click on the 'Softaculous' tool. By looking at the top scripts, the search bar or the navigation menu on the left side, you will quickly find the Magento page. Click the 'Install' button.
3. Fill out the install form.
Keep in mind the HTTP protocol (eg. http://www.example.com vs http://example.com, and if a SSL security certificate will be used). You can also email the installation details to your email address if you wish.
After you fill out the form and click the 'Install' button, the software will be instantly installed on your web site ready for you to use.