This is a sample blog posting.
If you log in to the site (the Author Login link is on the bottom of this page) you will be able to edit it and all of the other existing articles. You will also be able to create a new article.
As you add and modify articles you will see how your site changes and also how you can customise it in various ways.
Your home page is set to display the four most recent articles from the blog category in a column. Then there are links to the 4 articles before those. You can change those numbers by editing the content options settings in the blog tab in your site administrator.