I have setup discuz and checked all posts,attachments and pages yetI cant see the comments on any of my pages/posts.
You're asking this question in an incorrect place. This is the wpForo Wordpress plugin support forum. Here we support questions related to wpForo WordPress forum plugin. If you have questions related to wpForo please don't hesitate to contact us. We'll be happy to answer those questions.
If you install the wpDiscuz plugin you should ask the wpDiscuz plugin support forum. It can be found here: https://gvectors.com/forum/how-to-and-troubleshooting/