Write a Blog Post
To create a new blog post, simply click on the New Post button found in the lower right corner of the blog page.
Your blog post has a title and a content area. The title should generally be short - no more than a sentence long or so. Just like the headline of a newspaper article.
Adding content to a blog post works the same way as adding content to a regular page - drag elements into the post and edit them to add content.
Once you've added content you can categorize the post using Tags, found in the Post Options section - these tagged categories will appear on your blog sidebar, making it easier for visitors to your blog to find posts that cover certain topics. Categories can be whatever you like and it isn't necessary to use them.
Learn more about Tags and Categories here.
Now you can Publish the post to your live site (which will make it instantly available) or Save to Drafts to edit and publish it later.
If you save the post as a draft, it'll be accessible to you through a drafts area at the bottom of the blog page from within the editor (along with any other drafts you've saved). Just click the link to the post from this drafts area to edit it further and Save / Publish.
Every new post you Publish will appear at the very top of the page, pushing older posts further down the page. After you've added ten posts to the page, older posts will be moved off the main page to easily accessible archive pages. Published posts are also sent out to your RSS feed.
Lean how to Schedule Your Blog Posts