macOS 13 or later: Choose Apple menu  > System Settings, then click Bluetooth® in the sidebar. (You may need to scroll down.) On the right, turn on Bluetooth (if it’s not already on). Select your iPhone on the right, then click Connect.

macOS 12.5 or earlier: Choose Apple menu  > System Preferences, then click Bluetooth. If Bluetooth isn’t turned on, click Turn Bluetooth On. Select your iPhone, then click Connect.