1.Login to your blogger and open the post which you want at the top of the home page.
2.Click ‘Published on’ at the right hand side of the post.
3.After that set the date and time, a few years later in the future.
4.Click Done and update the post,y ou will see your post at the top of all post on your home page.
In this way you can quickly set the trading topic post at the top for your blogger, on ce post get outdated then you can remove it by changing the date to it was published on.The use of the featured post is that you will get more traffic to that post so make such post featured that is more useful for users.