Change header logo

Hi,
I have been trying to find where in my wordpress backend where my logo in header code is for ages but can not find it.

I have found it in google chrome element inspect but how can I change it on the wordpress site.

My site is https://www.rufcacademy.co.uk and this is code want to change
body > div.nav-container.full-menu.visible > nav > div.nav-bar.container.container-sm-full > div.module.left > a > img.logo.logo-dark

Many thanks
Nick

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