This theme supports the default Site Identity section provided by WordPress.
A Logo can be uploaded and changed to best suit your site.
From your WordPress Dashboard, go to the Appearance > Customize > Header > Site Identity section.
Now click on "Select logo" and pick a fitting logo for your site.
If you are dissatisfied with your logo, you can use the buttons below to change the logo or remove it.
Click on Publish.
It is shown in the image below:
Note: If the above process fails to change the logo of a specific post or page, then its logo has already been set using Page Settings. To learn more, consult this page: How to change the logo of an individual page?