The character encoding is not specified in the HTTP header

I have asked this before, but no one could shed any light on it. My SEO checker always turns this up as an issue, can anyone tell me how to resolve it please? Thank you.

Put this in Site Custom Header Code and publish:

<meta http-equiv="Content-type" content="text/html;charset=UTF-8"/>

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Thank you Sam, is this an important part of SEO?