Did you not get an email of the installation details? Thats usually included. Where did you tell it to install to? When you go to it in fantastico now, where does it say the installation is located? When you install a program from fantastico, its usually a stand alone. Meaning that it doesnt just MERGE to a website, you have to login to an admin panel ie:
www.magoostrikesagain.com/calender/admin
then your name and password
Karen