The widget can be found under the name ‘Widget for Eventbrite API’ and used in any widget area of your theme as appropriate.
The default settings should be enough to get you going, but you can customise what is shown through the widget panel.
The following is the settings used on the demo site here.
Note: private events are only available on the Pro version.
You can adjust the styling of your widget, either through your child theme’s CSS or the Theme Customiser’s Additional CSS tab in WordPress. For reference this is the default CSS that you can override.
You can also create a totally custom template by copying the template/widget.php and making your own adjustments, outline instructions are here.