Seems like that's a totally fresh install with no forums set up. If this was done on a live site then it seems something is wrong. Hopefully you took a backup beforehand.
What missing icons? You have nothing on your forum currently. It looks exactly like what the beginning of the demo version looks like. Add nodes and sections and you should see things change. Are you talking about the ones under "share this page"? If so, you either have changed a setting or the installation didn't work correctly.