Delete Slug v1.1.3

I've v1.1.3 installed. But due to previous installation and the slug "blogs" has been taken up and now I couldn't get my Blogs Directory to work because it always create new slug with "blogs-2" and so on...

I've checked and their is no page name "Blogs" exist in my Admin.

How do I remove the page with "Blogs" slug so that I can recreate again?

Thank you.