1. Select type of post (Status, Photo/Video etc).2. Click the Clock icon in the lower left hand corner.3. Select the future Year, Month, Day, Hour and Minute.4. Click Schedule.
Check your profile. Facebook may have changed your default email address to its own; i.e. @facebook.com (without your consent). To change back follow instructions at the end of the BBC link. http://www.bbc.co.uk/news/technology-18590929