Settings-> About Phone-> Build number
And located Build number (on the bottom) press 7 times in a row about it, we will show a message announcing that we are already a developer.
No return to "About phone" and see that there has appeared a new option called "Options Development". We walked in and mark the "USB Debugging" option, give "OK" to the message that appears us.
As you could have noticed it is very simple and is a process that takes less than a minute at most. This option can turn on and off when you want, repeating the same process.