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What section are you posting this in? Like Roleplay or Challenges? Cause not all threads are instantly approved if that is what you are alluding to. If that is the case and it is not approved in several days you should pm the forum mod of that section about the topic getting approved.
Did you post your thread in a board where all threads are required to be approved? That's probably why. Your thread needs to go through a process of approval, which normally takes a day or so. Since you mentioned it didn't go through for three days, it is more likely the moderator denied it.
Go ahead and contact the moderator of the section it was posted in. If you don't see your thread within 24 hours after posting it (or rather, sending it in for approval), then you're at liberty to do so. It wasn't in Challenges though, so it ain't me...