If you don't want to publish your post immediately, you can choose to save it as a draft or schedule it in advance, selecting the date and exact time for publication.
To save as a draft or schedule a post:
After creating the post, before publishing it, click the arrow next to the Publish button;
open the menu and select the option to Save as Draft or Schedule.
If you choose to schedule the publication, select the preferred day and time, and click 'Confirm' to schedule the post.
To see all the posts you've saved as drafts or scheduled, go to My Space. By clicking the pencil icon, you can access the individual post, edit it, or schedule it. You can edit all its elements, from the title to the #hashtags, before publishing.
You can schedule a post or save it as a draft in the My Space section as well. See how here!