turn on nearby friend in android Facebook told me that I must follow these steps to enable Nearby friend:  

To turn Nearby Friends on or off on an iPhone or Android:
Tap More
Tap Nearby Friends
Tap Setting
Tap to turn Nearby Friends on or off


I'm using Facebook latest on Android with Samsung Core Prime and I can not do those steps cause of I dont see Nearby Friend on the screen,
Please help me for enable it!
Many thanks!
I can not screenshot the phone, but I swear I can not see the the "nearby firends" button at all. 
samsung told me do these steps, but it's totally no help!


  To capture a screenshot, press and hold the Home Home key and the
  Power/Lock key simultaneously until a white border flashes around the
  edges of the screen. The screenshot will be copied to the clipboard
  and saved to the Screenshots folder in the Gallery.
Those are the correct instructions.  However, Nearby Friends was launched last April as a gradual roll-out.  As far as I can tell, it's still not generally available to everyone.  I do not have the option myself.