You're up and running!
Next you can update your site name, avatar and other options using the _config.yml file in the root of your repository (shown below).
The easiest way to make your first post is to edit this one. Go into /_posts/ and update the Hello World markdown file. For more instructions head over to the Jekyll Now repository on GitHub.
Last but not least
If the post is updated, the creation date, will be pushed. So it might happend, you see an existing page back on frontpage. I think, this approach is valid, so wrong information or gained information is covered. But if I am going to write a new part of topic, I might include an updated link to the new post.Home