How to implement Last-Modified for a site under management GRAV

Friends explain me please how can I set up Last-Modified. Thank you for any answer.

One of the stages of optimization of the Internet resource for the successful promotion and support of the site is server-side optimization. Among other things - setting up the correct server response to the request Last-Modified. Correct setting of this parameter will help in increasing the download speed of the site and will positively affect its indexing by search robots. This is what I need to configure.

Everything was simple enough, you need to go to the site settings, then on the “System” tab, scroll to the “HTTP Headers” section and set the settings as shown in the screenshot below:

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