All blog posts that you add to your website are sorted by dates. Blog posts will be displayed from newest to oldest — the newest posts are always at the top. If you want to change the order of your blog posts, you can edit the blog post date in post settings.
To change the blog date:
Click on Your Libraries at the top of the admin panel.
Select the option Blog posts for list of posts to appear.
Hover the mouse over the blog post name and click on the Edit button near the post.
The blog post editing window will appear. Click on the Post Settings button located in the top-right corner of the window.
Click on the calendar icon near the Date option, and select your post date & time.
Close the blog post settings and refresh the page to see changes.
Hint: when configuring a date, you can select a future date. This allow you to schedule a post, that will automatically be published that at a future date and time.