Hi, a friend of mine wasn't able to open the picture first. So I'll write down what to do in case you've got the same problem.
1. Open this website Wefugee.org on the browser of your smartphone. Click on the "Share" button down in the middle.
2. Select the "Add to Home Screen" button (in german for iOS: "Zum Home-Bildschirm", for Android "Zum Startbildschirm hinzufügen" oder "Shortcut hinzufügen")
3. Write the name you would like to give to the "application" on the first line, for example "Wefugee.org"
4. The "application" will appear now on your home screen.
Et voila, Wefugee as "App" :-)