Whenever you create a new post it will appear on the top of the home page. Some time you may prefer to change order of posts. To do this go to "Edit Posts" . Select the post for which you like to change order of post. Go to 'Post Options" at the bottom of the post and click on it. You will find the Heading 'Reader Comments' on the left and on the right hand side you will find 'Post time and date'. Below it there is two boxes. One for date and one for time. Put the desire date and time and save it.
You are done