Any block that has an image will have the option to change the it with the click of the CHANGE button that you will find in the block. The block in the image below gives us the abiility to change the iPhone image.
1. Click the CHANGE button.
2. When you click CHANGE, you may start uploading new images by click the green button.
3. Choose from the range of upload options and and click the blue UPLOAD button. ***Limit per upload is ten images
4. When the upload is complete, you will see your image(s) in your library. Simply click your desired image to change it on your site.
***It's important that you keep optimize your images to keep your site load time to a minimal. To compress images before uploading to builder, click HERE