read / unread label

I imported from Kunena a large forum. So now members have thousands of unread posts/replies. Aside from that I don't see a "Mark as Read" feature for users. Am I missing this? This is a pretty standard forum feature that users expect and now that I've migrated users are complaining that they cannot distinguish new threads and existing threads with new replies.

What users want is the ability to come to a forum now, read what they want then come back later and have a quick way to distinguish only what is unread and what is new since their last visit.

How would I implement lists of thread such as using the Most Recent or Category page, where a "New" label was next to each thread?

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