Someone correct me if I'm wrong. However, I believe the initial acceptance of coplay has to be done on a PC. Once you have coplay setup, you can easily transition accounts (on an android at least). You pull up the menu bar and it will show the typical icons at the bottom of a PC monitor. You have to swipe/scroll to the right to get the red logout button. If you logout this way instead of "switching worlds" then you can log directly into your coplayer.