If you are posting about an official game, you have to post in the correct forum for the game in question. For instance, posting about Pokémon Heart Gold? Go here; it covers everything from Diamond/Pearl through the Johto remakes. Want to talk about Black 2? Here is your destination, which also covers White 2. We also have a forum for the original B/W and other forums for the earlier generations as well (though 1st and 2nd share the same forum I think).
Alternatively, if you are looking to post about a hack you're doing, you have to have your thread approved by a moderator. That's the only way to post in the hacks sections: with moderational approval. Otherwise your thread will not appear. If your thread has nothing to do with hacking, it will never appear as it simply won't be approved. If you wish to comment on an existing hack, you must do so in the hacks' own thread.
Welcome to PC BTW. :)