I have an issue with something and would like to get help with it.
If you're trying to make a thread in the GameCube subforum, nobody can make threads there. It's for specific games. If you need help, make a thread in support.
If you're wondering why your thread hasn't shown up, it's because threads are on post moderation to stop spammers and will be approved when a moderator sees it. But by the looks of things, you haven't tried to make any other thread
There are pre-existing threads for every GameCube game, add a post to the thread for the relevant title.