Well, the game does not recognize if you click the link in the news text, which leads to the forum. It is just a normal URL = web address.
The game itself has to trigger, how often the news (window) was shown and stop that after one or more times, or on a specific date (which I don't know is set by Inno).
If Inno wants to show the news more then once, there should be - read above - the possibility to tick it off.