Using networked blogs is really easy.
Here's a little tutorial for you.
1.in the upper right corner of network blogs website, click register a blog
2. Put your website url and other detail then click next.
3. A confirmation will come out that you really owned the website you are going to register. just click yes.
4. Choose install the widget and get the code and install it on your blog. then it will confirmed when you finish clicking verify now.
5. When you have successfully registered the blog, just click profile and select the blog.
6. In the left side of the website you will find syndicate. Then just click grant permission.
7. Click add facebook target or add twitter target. choose the target you want. example: profile of facebook, fan pages and groups.
And its done. I forgot how to add the tab to your facebook fanpage though but I think its easy, just forgot.
So everytime you post on your blog it will automatically syndicate to all your target facebook wall.
Hope it helps.