Hey @shirazcivil, 
Thanks for your post. Before getting started, please be sure that you’ve enabled Bluetooth functionality on your mobile device. Once you have enabled Bluetooth, please follow these instructions:

1. Open the Strava mobile application and select Record from the bottom navigation bar.
2. On the record screen, select the heart rate icon along the bottom row of icons.
3. Wake your Bluetooth heart rate monitor (please follow the recording device manufacturer’s manual if you are unable to wake your device) so it may be discovered in the list of recording devices.
4. Select your heart rate monitor from the list of available devices. Once connected, your heart rate will be displayed live on the record screen.

You can learn more about pairing a Bluetooth device on our support page here.