The GM (or I believe the thread-starter) can click Delete on the top post of the thread. This will Hide the thread from the Players and the thread title and contents will not be visible to Players viewing that forum. The thread will still be visible to the game Creator, but it will have a colorful notice that tells you it has been deleted. Note: Threads are separate in the 2 forums, LFG forum and game forum. Delete in both places or whichever it appears.