Blog DIrectory Not Working

I was able to successfully install the Blogs Director Plugin. When I activated it, it automatically added a page called "Blogs." When I viewed that page, it said "Page Invalid" (or it may have been "Invalid Page." I deleted that page, and tried to create a new page, and realized that my site uses numerical permalinks, and not name permalinks. How can I add a new page with the slug "Blogs."

Under the options Page, I see the options for Blogs Directory.

Thanks