In the /blogs folder there is a file called [sample.htaccess]. You should try renaming it to [.htaccess].
This will optimize the way b2evolution is handled by the webserver (if you are using Apache). This file is not active by default because a few hosts would display an error right away when you try to use it. If this happens to you when you rename the file, just remove it and you'll be fine.
b2evolution uses old-style permalinks and feedback links by default. This is to ensure maximum compatibility with various webserver configurations.
Nethertheless, once you feel comfortable with b2evolution, you should try activating clean permalinks in the Global Settings > Link options in the admin interface.