Thank for purchasing.
The HTML template is locate in dest directory.
Blockbuster currently using Google font. The fonts are enqueued in the <head> of html files:
To change font family name, navigate to css/style.css:

head body
.ht_header
.page_content
.main_sl (slider)
._section_movieandtvshow
._section_trailers
._section_latestnew1
/.page_content
.ht_footer
/body
Header contain Menu (desktop and mobile display).
Header comes with 2 option: top_section (Top search) and box_mn (Menu). You can change info on top_section and box_mn here
Header
top_section
box_mn