Planning GUI position for iOS

I am making a 2d game made with some GUI elements. I just built the project for the iPhone 5 and the positioning is off. How do I position the GUI with javascript or in the game editor? Also how does the game editor screen translate to the iOS device screens? This will help me figure out if I place a GUI button somewhere in the editor where it will appear on an iOS device’s screen.

Instead of using free aspect mode, create a custom aspect ratio 1136 x 640. That is the resolution of the iPhone 5 wide view. Then, position your GUI to look right in your editor. It will carry over to your iPhone correctly since the resolution is the same.