I'm really sorry, but wpForo doesn't have such a feature.
In the next version release, we're going to add a post preview feature. The view icon will be visible on TinyMCE editor, but I'm not sure if it'll work in case of the articles.
Thanks for the information, I attempted to write my own code, and "call" the plugin function in my Functions.php theme file, but I don't wpforo code well enough to do it. That functionality would be great!
Again, I appreciate your response.