You need to configure WSO2 EMM in order to get it working. However for Android devices silent installation and uninstallation does not work until you install the Android Agent app as a system app in your devices. So it will prompt a message to user when EMM server perform an installation or uninstallation operation on the device. But for iOS it happens without use intervention.
if you blocking an app, EMM 1.0.0 shows an warning message to the android users to remove it. and for iOS it actually block the app.
You can use policies to block apps and install apps to the devices.
For iOS you need to configure it according to the documentation in order to get it working. For Android it works without any configurations, but if you are going for production you need to configure it.