WordPress.org

Where is the feed located?

At http://your-web-address/?wp-calendar-ical

How can I add the iCal URL to my website

Place the following code to your theme

echo ical_wp_calendar_getIcalUrl();

or use a widget like the Text Widget to your sidebar and place a code like

<ul class="feed-list">
  <li><a href="http://your-web-address/?wp-calendar-ical">All Events (iCal)</a></li>
</ul>

How can the list of feeds be limited?

By adding 'category=1' to the feed url, you can limit to events, which are asssigned to the (post) category 1. The feed url will then look like

http://your-web-address/?wp-calendar-ical&category=1