How can i connect my garmin venu

Hi all ! I have garmin venu. I researched some websites but i couldnt find how can i connect. i tried heart rate boardcasting from wirst heart rate (it doesnt work), i downloaded treadmill smart speed app from app store (zwift connected but not sending bpm) any suggestions? thx

*i use imac 2013, iphone 7

That Garmin broadcast HR in real-time using ANT+, your best option would be a chest based duel band HRM like Wahoo Tickr or Garmin Dual.