Application configuration can be modified in Web.config via "appSettings" section.
By default BlogEngine configured to run as single blog application:
<add key="BlogEngine.UsageScenario" value="singleblog" />
This setup removes some advanced features and restricts application to single blog with single author. This is perfect for novice bloggers and is most common application usage by far.
Other options are:
<add key="BlogEngine.UsageScenario" value="multiusers" />
Multiusers will allow run application for multiple users with membership and advanced settings displayed. It is a good fit for more advanced environment, with blog users having good understanding of their roles and rights.
<add key="BlogEngine.UsageScenario" value="multiblogs" />
This option enables running multiple blogs on the same application instance, each blog having single author.
This all needed to narrow focus to 3 common scenarios so it is easier to test and maintain. Developers can easily reconfigure it any way they like, but BlogEgnine team can't support infinite usages and will plan testing around these common configuration.