I know that nearly all of the bloggers here Know what am talking about and how you can do it, but some people who don't know it just follow this step.
i. Publish the post that you want to make sticky. If you follow the steps below without publishing first, your post will be scheduled and will not appear on your blog. ...
ii. Click on "edit" on the post's screen.
iii. Click "Published on".
iv. Choose "Set date and time".
v. Enter a future date. ...
vi. Click "Done".