HubSpot CMS Guide: How to modify your website template
Warning: Before you proceed, make sure you want to change your template settings, as this will change the look and feel of your website. If you have had a professional design your site, or if you have custom CSS, you probably don't want to change these settings.
Scroll through the various settings and make any changes that are necessary. There are descriptions under each setting, so read those so you can be sure you understand what you're changing.
When you're finished, scroll to the bottom of the page and click Save. If you're looking for more information on the actual design of templates, you can go to the HubSpot CMS Templates page.