@TassieNZ or someone could you please explain to me the exact path to which I should paste this procedure below:
Message Warning: Really Simple SSL has detected NGINX as webserver. The security headers are currently set using PHP which can cause issues with caching. To enable the headers directly in NGINX add the following line (s) to the NGINX server block within your NGINX configuration:
add_header x-xss-protection "1; mode = block" always;
add_header X-Content-Type-Options "nosniff";
add_header Referrer-Policy: "no-referrer-when-downgrade";
Within the My Site root folder are these folders: