To find out how to replace existing images of an Overlay, check out this article. Start by selecting the desired Overlay, navigate to the image you want to replace with another one and replace the URL. All images have to be available online through URLs.
Step 1: Choose the desired overlay.
Step 2: Navigate to the image you want to replace with another one. You are replacing the Mailchimp logo (the top left), the picture in the center and the Apple logo in the top right.
Step 3: Paste the desired URL in place of the old one. In the following screenshot, only the Apple logo URL has been changed. Repeat the process for the other images.
Step 4: Save and present.
