Wait a minute, to use geocities, you need to have yahoo. Did you delete yahoo after you created the sight or something(lol). You need an adress just to enter the edit sight. Install yahoo again, and it should work.
Also, is the 6.5MB .zipped? That could also be the problem. And I'm guessing that your URL has _ and not spaces(can't really tell because of the underline), because spaces are a problem to geocities.
Oh and one more thing(lol, this gets me all the time
), geocities is case sensitive so you have to spell it EXACTLY as is, meaning 'TheCity' isn't the same as 'thecity', hope I helped, because by the discription, the game REALLY sounds great and playable.