This is the second example blog post. Because you are a blogger, the blog has been set as your homepage and user submitted blog posts are also enabled. Users who create an account and are signed in to your nation can simply click the "Add your voice" box above and contribute to your blog as well. If you want to disable this, click Websites > Blog > Blog Settings and uncheck "Allow logged in users to post from site."
NationBuilder makes it easy to create as many separate blogs as you want. Simply click Websites > New page and select the Blog page type to create a new one. This can be useful when you want to separate blog posts by category. You can also create a blog which includes posts from all your blogs. Of course you can also add tags to any blog post by editing the blog post and clicking Settings. This blog post has the tag "example tag."