https://www.alittlebitoffiddle.com/blog/
I think the last post was made in Jan 2012. It’s almost 2 years, may be there would have been lot’s of changes you made.
Based on your past 2 years of posts, I think you would have used WordPress one click install for , If you can see that in your cPanel, you can uninstall a particular installation in seconds.
Else, you will have to delete the folder in Public_html/ (if there is only one domain being hosted on this hosting account). If there are more domains
Public_html/ see he name of the domain and delete it completely.
Simultaneously delete the database related to it.