Servo Example doesn't work

Navio / Edge Getting started
1

I’m trying create new drone without ArduPlan.
I want to test Servo Example code but it doesn’t work.
My servo is SG90. Anyone knows the reason?
When I don’t run any code, + of 14 pins give 5V?

2

Hi

Please, connect BEC to the servo rail and everything will work

3

I understand。
Thank you.