Individual members who are moderated by flagging the account for moderation will be moderated everywhere throughout the community, however, to ensure that all threads and replies are moderated within a specific forum regardless of the author's account moderation status, navigate to the forum, Manage > Manage Forum > Forum Options and ensure that Moderate Threads/Replies is checked (if not, check it and click Save). Moderation of all new threads and replies in the forum will then go through the moderation workflow.