Congratulations, snakeslane! You may submit once every 14 days.
Taking a look at your profile, I can see that many of your poems are written entirely in italics. I recommend switching them to regular text in order to make it more likely that they will be accepted to LetterPile in the future when you submit.
Yep, HP dislikes italics apparently for any use, Snakes. I've used italics to display letters written from other characters in my short tales, but the editors returned them back to normal text when they edited them. They just don't like italics, I tell ya!