Navigate to app -> res -> string.xml and search for app_name and update your app name here.
Set App name and version on Admin Panel
Navigate your admin panel -> Settings -> Android Settings -> update your app name and version here. Version should be similar to what you have given in build.gradle file in Android App
For App Icon
Navigate to file -> new -> Image Asset
Import your background and foreground (not mandatory to select both, if already have an image just import to foreground or background and make another as transparent) app icon/color
Then click Next -> Save and run your app, you are done. Congrats!!