WordPress is a free and open source blogging tool . It is very popular blogging system in use on the web. It is a software which used to create web site.
Step1:Login to cpanel
Step2:Got to Software/Services and click to quickinstall
Step3:just below of Blog Software there is WordPress, Just click on WordPress
Step4:then Click on continue to install wordpress
Step5:After that it will ask for your daefault domain details so you have to put it mannually eg: http://yourdomain.com/blog
Step6:After that fill the required information which it ask: Admin Email, Blog Title, First Name, Last Name and all
Step7:and then it installed finally you will see a “Congratulations” Message.
For more information Please see this video to install wordpress on Cpanel: