To use the blog Manager tool, login to your site and click on Management tools, theh click on Blog Manager.
1. Click, "Create Blog" and then enter in a Blog Title and an email address that you would like to use to moderate the blog.
2. You will then be taken to your blog settings page. Read through this documentation carefully and fill out with the preferences you would like on this page.
3. Once this is completed... you can go to that blog and click on it and now add an entry. Just click on the blog entry and then click on the "Add Entry".
4. Again, just fill out this portion for your own preferences. For the actual content of your blog, we recommend clicking on "Web Editor" and you enter in your content there.
For a blog roll, see this article for assistance on this.