[Hummingbird] Cache problem

When trying to use the plugin, I get this: “Your server may not have the “expires” module enabled (mod_expires for Apache, ngx_http_headers_module for NGINX)”

I contacted the web hosting company and they can’t help me.

Furthermore, concerning the Smush plugin, “Smush” doesn’t show up on the media page. Please view: https://drive.google.com/file/d/1UTJKPejt1dHpeRLOpla3DERSOAFzIPjK/view?usp=sharing