[kronolith] free/busy URL not avail

[Alan]

Dear All,
I have the following sonfig:
- ReadHat 9.0
- apache 2.0.49
- mysql 4.0.18
- horde 3.0.2
- imp H3 4.0.1
- kronolith h3.2.0.1
- nag 2.0.1
- turba 2.0

1) when I add attendees to meeting, it was reported free/busy URL not 
avail. Pls advise on how to add the free/busy URL and its requirements;
2) does imp h3 4.0.1 support calender sharing? How could I do it?
2) on nag, there was options on setting permissions, pls advise on how 
to use o the permisison features.

Thank you very much for your help.

Regards
Alan