Wordpress.com and Wordpress.org are websites, not software. They can neither be installed nor uninstalled. However, you can point your web browser to those websites to view their content.
If you are looking to install the WordPress software, you can do that by clicking on Site Software in your cPanel interface then clicking on "WordPress" in the Blogs category. You can also follow these steps to uninstall WordPress at a later time, assuming you installed it via the Site Software page.
Yeah, that part of the user's post left me scratching my head too.
Anyway though ....
If the question is removing "Wordpress", it's just a simple matter of
removing the files and the database from the site.
If using some sort of redirect to those sites, the redirect needs to be updated and on that one I can't think of any way to do that from Cpanel other than perhaps the edit functions in the file manager though that would most certainly not be my preferred editor of choice.