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It sounds like the thread:create API permission is not enabled. Check that the API user you created in XF has this permission. Once confirmed, go back to your WP site and refresh the "Site setup" section to see your recognized permissions:
Let me know if you have made any progress on this and if you have further questions about the plugin's usage.
I do not have thread:create permission. I have read/write. I was referring to the thread action in the post. You said I would be able to select a forum(node) for the posts from WP. I do not see that option. I can only create a thread, but in which forum ?