Registration is usually closed to prevent spam accounts. If you donate (at least) 0.001 litecoins to LbZbPreKJHCtPjJrRaQNJ2U7s8rdybrXxh, then a bot will open registration for about an hour. Alternatively, you can send an email to requesting that registration be opened on a particular day (at least one week in the future). You can also simply check this page later and registration might be open. Spam accounts posting irrelevant links will still be deleted.