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Welcome to the new forum. You will have to register to participate (re-register if you were a member of the old forum.) To add a new Discussion, hit the red button "New Discussion" and choose the correct category from the dropdown menu. If you are responding to an already existing discussion, just comment.
The FAQs for each expansion contain some helpful information but may apply more to the Classic version than to the HD version in some cases. If you don't see what you need, just ask. Be warned that the FAQs do contain spoilers.