Once you have tagged devices and added them to groups, open your dashboard https://commbox.glbth.com/index.html#/dashboard, on the side menu click groups, choose the group you wish to manage and click the 3 dots to open the actions menu. Select install packages and 'Add New'.
Choose from url, local or google play store link. Enter the information, select the package[app] and click 'Confirm'.
This action is almost instantaneous but all devices need to be connected to the network for this action to apply.