I am seeing a lot of this so I thought I should explain what a double post is and when you may receive a warning for this from one of the moderators.
You have 30 minutes to edit your post so that means for 30 minutes if you think of something else you want to say you need to edit your original post. If you post again on the same topic within 30 minutes the two posts will be merged and you will receive a warning from a moderator for a double post. This would be when posting again behind yourself not in the normal flow of conversation. So in other words, if you are not having a conversation with someone do not post twice on the same topic within 30 minutes.
If there are any questions please feel free to ask. 
