You must modify the launcher.txt file to add your .ical calendar URLs as an argument.

The URLS are separated by commas and can be preceded by a title followed by a 
vertical pipe "|" before the URL.

Currently doesn't allow any spaces at all.

Example:

com.blackledge.david.tivo.calendar.Calendar Title_1|http://mycal.com/mycal1.ics,Title_2|http://mycal.com/mycal2.ics,2009-2010_NFL|http://www.mysportscal.com/Files_iCal_CSV/iCal_NFL_2009-2010/NFL_2009-2010_complete.ics,2009_Major_League_Baseball|http://www.mysportscal.com/Files_iCal_CSV/iCal_MLB_2009/MLB_complete_09.ics