How do I reset directory theme to default?

I’m hoping someone can help…being a beginner with wordpress etc I began changing my directory theme (Responsive Directory Theme) rather than installing a child theme, which I now realise I should have done.

I am trying to go back to the beginning with the original template and start again. I do not have a live site yet, as it’s currently hosted elsewhere so cannot show you guys.

I have deleted the file DT from my account and renamed and reinstalled the DT yet it still reverts to the changes and entries I had made. Any suggestions much appreciated

Thanks

Karen