So the problem is that he can’t post where you want him to so he starts posting other places. [quote]
Number of posts in a row a user can make in a topic before being prevented from adding another reply. This limit does not apply to the topic owner, site staff, or category moderators.
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So the solution is to see that he can post where you want him to. Is it max consecutive replies that’s causing the problem?
that he’s hitting because he won’t edit posts and instead just keeps replying to himself? Maybe just change the setting or teach him to edit?