[Plugin: Events Manager] iCal Help

I have the events manager plugin installed and working fine on the site, the question i have is how does ical work? I have tried to read through here but not getting anywhere.
My site is t my domain.com/wordpress
in order to get ical set up

1) is there something I need to activate in settings?
2)Is there a code I need to add?
3) Is it visible as a link on the events calendar widget? or on a normal events calendar page?

would like to get it going, any help would be great.

thanks.

http://ww.wp.xz.cn/extend/plugins/events-manager/