Blogger vs WordPress Blog

My WordPress blogs's URL is birkbinnard.com/blog. I built and maintain it using Chrome browser. I just discovered the WordPress Windows app and installed it. But I could not figure out how to use the app to edit/maintain my blog. By mistake I created 2 empty blog sites that I wish to delete. So my questions are:

1. Can I use the WordPress app to maintain my existing blog at birkbinnard.com/blog?

2, If the answer is yes, how do I get the WordPress app to recognize my active blog?

3. How do I delete the 2 empty blogs from the WordPress app?

The blog I need help with is birkbinnard.wordpress.com.

Source: 3 Questions about WordPress app