First you choose which calendars/categories you want to include in your frontend

then you choose what kind of frontend output you need; event listing, teaser listing or minicalendar

Set the number of entries shown in the teaser listing (always from today)

Choose the template with its corresponding css file.
To add/edit the templates see the indicated path in your module directory.

The sort order and the link destination - most likely you want to link your teaser with the event listing somewhere else on your website.
Optionally you can add the anchor to the link so in long listings it jumps right to the selected entry.

In order to place a calendar teaser in your site template use the RT indicated wherever you like in your template. The article with the current CP should then lie in some hidden structure.

For templating see events listing.