1. Login to the cPanel, http://yourdomain.com/cpanel

2. Go to Software -> Softaculous (or Site software)

3. Choose Wordpress -> Install

Enter the following:-

Choose Protocol: http://
Choose Domain: yourdomain.com
In Directory: <Leave it empty to install in root directory>
Site Name: <Your website name>
Site Description: <Your website description>
Admin Username: <Your username>
Admin Password: <Your password
Admin Email: <Your email address>

4. Click Install

5. Done. You can login to http://yourdomain.com/wp-login.php for testing