Step 1 - Add the "Single Image" Block Section on the Page

On the page you're working on, click "Add Section" from the sidebar, then select and add "Single Image"

Step 2 - Upload the Image and Adjust the Size

Upload the image and adjust the image width. The image adjusts in scale based on the width you select and is centered on the page. 

Optionally, you can paste in a URL so when people click on the image, they are redirected to that page.

Step 3 - Don't forget to save your work!