Some of the apps on Prota don't have an actual user interface, the app is merely a link between the service and the Prota. This applies to apps such as IFTTT and DNLA. You can see the small screen icon on the right top corner of the app, which indicates that the app has not interface.
For example, when you use IFTTT with Prota, you only have to make sure that the app is installed on the Prota. The rest, such as connecting to IFTTT and making applets, happens through the official IFTTT app or ifttt.com. You can see more detailed information on how to connect and use IFTTT here.