Ok, so whenever I saved the settings and going back to tab 'campaign', or some other tab before going to tab 'stations', the campaign the station had to play wasn't stored. Besides, I noticed that the station wasn't shown with its station name next to the green dot. However, it was shown at the right top side of the screen. After I saved again I logged out and logged back in again, the station name was shown next to the green dot. Besides it also saved which campaign to play. By choosing save and restart player, the player restarted and plays the campaign

I still have the question, how to go back to the campaigns main menu, whenever I am editting a campaign without having to logout and back in again.
I also noticed, that whenever I use the HTML website content plugin, I am unable to save a website (http://...), so the default website is being shown. This is weird, because a custom RSS ticker tape is stored and shown perfectly

. Whenever I try to do this on my android tablet using the default browser, hitting the 'web adress' will cause the tablet to change the web adress of the browser.