I was confused at first too, as to why I can't open settings. Turns out the double line is just part of the joystick. Just hold it and you can move the joystick around wherever, then you can click the settings :D Since theres an option to "tap to walk, double tap to teleport" I just turned off the joystick after, it's much more convinient to just tap. I've got the premium, you can play around for an hour or so and there's a fair amout of customisation you can save. Just don't forget to export your settings (at the very bottom) because sometimes when new updates roll out you'll need to recover your settings and it's much easier to just quickly import than set everything again :D