1. Go to the settings menu, and scroll down to “About phone.” Tap it.
2. Scroll down to the bottom again, where you see “Build number.”
3. Tap it seven (7) times. After the third tap, you’ll see a playful dialog that says you’re four taps away from being a developer. (If only it were that simple, eh?) Keep on tapping, and *poof*, you’ve got the developer settings back.
   – How to enable developer settings on Android 4.2 | Android Central.

Easy. I look forward to all the Stack Overflow questions.