1) Login to your blog.
The navigational bar on the left hand side of the page allows you to choose whether or not you want to create a new entry, see a listing of you current entries, add/remove/edit your categories, change the templates and styles applied to your blog's pages, and more...
3) To begin, you can start by adding some categories...
... Or, click on the "New Entry" button, and begin writing a blog entry.
4) Finally, save your entry and view your web page.