Added WordPress to a forum. Is there a way to allow only forum users to comment in WP?

I just set up a WordPress blog to run as part of the forum (powered by XenForo.com). I’d love to let *only* registered forum members to be able to comment on blog posts.

In case someone here knows how to achieve that, I’d greatly appreciate a very basic list of steps involved in order to do that. I am okay using any paid third-party integration plugins, if necessary.

Thank you!

 

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