Well, I’ll try, but it is likely to be something you might find difficult if you have never worked with RSS before.
The first problem (and a potential "deal-breaker) is, that after reviewing the DH “one-click” installation of WebCalendar, you must be running WebCalendar 1.1 or higher to use the “built-in” RSS feed generating capabilities of Web Calendar. The DH “one-click” installer currently installs/upgrades to only version 1.05 - so you will have to “manually” upgrade your WebCalendar to version 1.1+. Instructions for this are available via the documentation available at [url=webcalendar.sourceforge.net/]the WebCalendar website.
Once this is done, you will need to use the admin -> Settings tool in the WebCalendar back-end to "enable public subscriptions so that the RSS feed link(s) is/are generated/displayed.
That is the general process. In reviewing that, it might be a bit much for you to attempt at present, so it might be best to look for another alternative.
Possibly a search of the web via Google will reveal a tool/method for taking ical compatible info and generating an RSS feed for that (this might enable you to skip the WebCalendar upgrade step), or another approach altogether.