1. Select FireStick Settings.

2. Click My Fire TV. (If you do not see My Fire TV you may have to click Device & Software)

3. Click About (only if you DO NOT see Developer Options on this screen).

4. Highlight the first option on the list, which is usually your device's name, and click it quickly 7 times.

5. You will see a notification at the bottom saying No need, you are already a developer. That’s it, you have enabled Developer Options.

6. Press the back button once or go back to Settings > My Fire TV and you will now see Developer Options.

7. Click on Developer Options and click on Apps from Unknown Sources and turn it ON