Hi there. All submitted Creations have to be manually viewed before they are approved or rejected. Depending on how many Creations have been submitted recently, it could take a while to get through them all.
Make sure your Creation was submitted as a direct link, and if it's a video, it would be best if it's not too long and doesn't contain too much profanity. You will receive a notification when your Creation is approved, but not if it's rejected.