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 nest oldest articles. You can change those numbers by editing the content options settings in the blog tab in your site administrator. There is a link to your site administrator in the top menu.
If you want to have your blog post broken into two parts, an introduction and then a full length separate page, use the Read More button to insert a break.
Templates control the look and feel of your website.
This blog is installed with the Protostar template.
You can edit the options by clicking on the Working on Your Site, Template Settings link in the top menu (visible when you login).
For example you can change the site background color, highlights color, site title, site description and title font used.
More options are available in the site administrator. You may also install a new template using the extension manager.