Ah I see. Did you change the lobby URL in the config file? There's a config file with a lobby URL, you need to change it to point to the correct lobby where servers will show. Or is that what you with the changing the default server?
Edit: Just checking, are you running at least version 2.65? Also, I mentioned changing the config file, I've just been reminded the file is downloaded separately and then just replaced, no need to change it. I'll DM the unofficial "official" guide from the forums.