If you see this post it means that BlogEngine.NET 1.4.5 is running with SQLite and the DbBlogProvider is configured correctly.
You are configured to have your user names and passwords stored in SQLite by default. It is time to setup some users. Find the sign-in link located either at the bottom or top of the page depending on your current theme and click it. Now enter "admin" in both the username and password fields and click the button. You will now see an admin menu appear. It has a link to the "Users" admin page. You should also see a link to a Change Password page. You should use this to change the default password right away.
Since you are using SQLite to store your posts, most information is stored there. However, if you want to store attachments or images in the blog, you will want write permissions setup on the App_Data folder.
On the web
You can find BlogEngine.NET on the official website. Here you will find tutorials, documentation, tips and tricks and much more. The ongoing development of BlogEngine.NET can be followed at CodePlex where the daily builds will be published for anyone to download.
Good luck and happy writing.
The BlogEngine.NET team