Using Shopify's Theme Editor
Once you've installed the theme you can configure it in Shopify's Theme Editor by clicking Customize.
The Sections tab contains the building blocks of your store. All sections contain unique settings and content blocks that can be configured to create layouts.
The Theme Settings tab contains universal settings for design elements like typography and colors.
Changing preset style
Themes are bundled with presets which have preconfigured theme settings for typography and colors.
To change the theme preset, go to the Theme settings tab and click Change theme style.