problem with theme installation Taxico

I am trying to use thw taxico theme (https://elements.envato.com/fr/taxico-taxi-company-online-cab-service-elementor-t-FFC6WCH) on my website. I followed the instructions step by step but I’m stuck on the header and footer of the site. On the tuto, at the part Setup Global Header and Footer in Header Footer & Blocks plugin, ‘’ 4. Click Edit with Elementor’’ does not appear

Please has anyone used this theme before? Thanks for your help.