Thank you for your feedback.
The first couple of sentences in the description say "DiaryPress is a plugin designed to allow your blog to operate like a private diary. It will ask you to login in order to access the content" I'm not sure how I could make it clearer? What would you suggest to make it clearer to WordPress users?
The plugin itself is deigned for very specific use cases, such as those who want to use WordPress as a private diary that is not accessible to the public. Its safer to use WordPress than keep a paper diary under a pillow!
I am currently developing new features at the moment including controls to customize the screen within the WordPress admin panel.