How do I add a header as my Site-title for the theme 'Point'

So I know my way around HTML and CSS and etc. My only issue is with this new theme I have I don’t know how to insert a header as my title. So instead of my site-title I’d like to add a custom made header and thats where I’m stuck at because I don’t know where to add this header now. Thank you for your time. Here is my website -https://cinemacrash.com