A logo is an important part of your course website. Let us see how to add a logo to your website. (Watch From 2:00-2:20s)
How to Add A Logo To Your Course Website
In the website builder on the top left corner click on the edit button on the "Add image here" dotted box. In the pop-up dialog box Click on the Upload button.
Select an image from the browser by clicking on the Select Image from your Computer button or Drag and Drop it from your computer's local drive.

Note: Image size should be 48px x 48px
You can Crop the uploaded image or upload the image as it is.

Now, Click on Save

The uploaded image is displayed on the preview page of your school website
