expired headers - how to?

I did a speed test of my forum and got an F (and the forum is very slow)

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Royal Enfield Himalayan, Scram and new 350s Forum

forum.himalayan-tools.com

Improve page performance​

Grade	Suggestion
F23	Add Expires headers

I am on a shared Linux based server with confixx as control surface but could not find an option to "add expired headers" as suggested.

any hints how this can be done?

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