How to enable Expires headers

Hi there, I hope this is the right forum to post this question to.


I'm getting "Add Expires headers" in GTmetrix. I'm using Apache + Nginx + Varnish.
According to this tutorial (dated 2015):

For additional module activation you only need to add a new line in the text box, like for example:


--enable-expires
--enable-headers
--enable-proxy

But I don't see any text box to add these.


Can you please advise how to properly enable Expires headers?


TIA!