I think we should add a bullet point about 'posting an entry from the past', as that's the other main usage of the option -- and if that's what they're looking to do, then they very well may skip right over that 'keep an entry at the top, future date' bullet point. Nowhere else in the page does it tell them how to actually access/use the feature (click edit, blah).
So I'd suggest a new second bullet point of:
"Posting an entry in the past: Click the Edit link (beside the Date field on the Update Journal or Edit Journal page), assign a date and time in the past, and select the "Date Out of Order" option."
I know it's repeating the same information, but unless we pull the 'click Edit, blah' out to the very top paragraph (before bullet points), I think it's a valid repetition.
ETA: Trying to remember to tag this entry myself instead of the nice people who do it for me later on because I always forget, LOL. I put 'faq91' and 'status-pending' as tags -- someone please let me know if either of these was correct and/or what else should have gone here.