Site settings allow you to add the event calendar url where your events calendar will live, name it, add a link to your sales media kit, chose the publisher type and add a short description about your site. Be sure that the Event Calendar URL is where the event calendar code is present on your site. See here how you can Get Code - The guide to adding calendars to your site.
This is also where you can select the Theme for your calendar. The Theme will determine the colors for your calendar. To create a new theme for a site, select "Add a Theme" here. See more info about How to add and edit the theme for your calendar(s).