How to Access Developer Options on the S5

1. Go to the settings menu on your GS5.
2. Scroll down to the "System section and tap "About Device."
3. Now scroll down to "Build number."
4. Tap the "Build number" section seven times. (You'll see a warning that you're about to unlock developer options.)
5. Now back out to the main settings menu, and you'll see "Developer options" listed.

This is where you will find the option turn on USB Debugging.