Delete the logo and replace it with a header image.

[Noble]

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1. open  yourwebsite.com\Themes\default\index.template.php

Find and delete all

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echo '
    <div id="header">
        <h1 class="forumtitle">
            <a id="top" href="', $scripturl, '">', empty($context['header_logo_url_html_safe']) ? $context['forum_name_html_safe'] : '<img src="' . $context['header_logo_url_html_safe'] . '" alt="' . $context['forum_name_html_safe'] . '">', '</a>
        </h1>';

    echo '
        ', empty($settings['site_slogan']) ? '<img id="smflogo" src="' . $settings['images_url'] . '/smflogo.svg" alt="Simple Machines Forum" title="Simple Machines Forum">' : '<div id="siteslogan">' . $settings['site_slogan'] . '</div>', '';

2. fine

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</div><!-- .inner_wrap -->
    </div><!-- #top_section -->';

echo '
3. add to

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<div id="header">
            <h class="forumtitle">
                <a href=""><img src="[color=red]https://i.postimg.cc/nhzrq7LS/test.jpg[/color]" alt="" title=""></a>
            </h>
    </div>


finish

[lurkalot]

Or just install the attached mod here, https://www.simplemachines.org/community/index.php?topic=588525.msg4172009#msg4172009