How do I change the company logo
This configuration is at CMS level but not in CiviCRM. You can update the logo through theme config.

For Drupal

1. Navigate to Appearance &gt;&gt; Settings and under Logo image setting upload the new image and save.
2. Clear Drupal cache( and sometimes browser cache).


For Wordpress

1. Here it depends on the theme you using. For most of the theme you can change the logo by navigating to Appearance &gt;&gt; Header. You will be redirected to page where you can update the logo.
2. Save the theme setting.


HTH

Pradeep