By default, a popular post is defined as one that has at least 15 replies, 200 views, and had a new post made within the last three days.
To change the popularity settings:
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Navigate to Control Panel Dashboard > Forum Administration > Configuration > Global Forum Settings > Popular Posts.

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Specify in Popular Post Replies the number of replies that are required for a forum thread to be categorized as popular.
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Specify in Popular Posts Views the number of views that are required for a forum thread to be categorized as popular. This view is a total of views for all posts within the thread.
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In Popular Posts Age, specify the number of days within which a thread must have a new reply to be included in the popular thread list.
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Click Save.
To learn about creating a list of most popular blog posts, see List most popular blog posts.