Is the screen for choosing like a GUI, or just a bland blue screen with like yellow letters or sometihing? And does that mean when you turnnit off, ou have the choose again?
It is neither. A Dingux splash screen comes up and the OS which boots is determined by pressing the Select button. There are two dualboot versions, the only difference is the 'default'. For Native default, if you do nothing when you see the splash screen, you go to the Native OS; if you press Select then you get Dingux.
For Dingux default, if you do nothing you get dingux, and if you press Select you get the native OS.
And yes, you have to do this every time you reboot.