ABRP Download link:A Better Routeplanner (ABRP) on the App Store (apple.com)

NOTE:
Just enable Bluetooth settings on your iOS device.
DO NOT Need to connect Bluetooth Name on iOS device.
Then connect the Bluetooth device name in the OBD app setting.

Step1:
Open the APP and click the button in the upper left corner.





Step2:
Click on:"Plan sttings".





Step3:
Click on:"Edit settings".



Step4:
Click on:"+ OBD".





Step5:
Click on:"Understood".





Step6:
Select "vLinker MC-iOS".





Step7:
Connected successfully.