How do I schedule a blog post to publish at a future date and time?

You can schedule a blog post while creating or editing it using the Blog Scheduler panel.

Go to Marketing > Blogs and click + New or open an existing post.
In the right panel, under Blog Scheduler, enable the Schedule For Later toggle.
A Set Date and Time field will appear — enter the date (dd/MM/yyyy) and time (HH:MM) you want the post to go live.
Click Schedule to save the scheduled post.