we are in the process of upgrading from VB3 to VB4. For the life of us we cannot figure out how to turn on the Nav Bar that includes the User CP. etc. Our primary focus is trying how to turn on the "New Posts" feature and I have looked through everything in the CP
Assuming you're using the latest version (vb4.2.0), then you can look in Settings > Navigation Manager. Click on "Forum" to see the links that should appear on the forum page. But I think "New Posts" should be there by default.