How to setup App icon
Open the App Dashboard page and click on the square-shaped control located on the bottom left of the phone preview screen. It will come up with file browser window - locate an image file you’d like to use for your app icon and click "Open".
The image dimension should be 1024 x 1024px otherwise it will be cropped and resized. Smaller image will be scaled larger than its actual size, which would significantly reduce the image quality.