admob doesnt appear in iphone simulator - flutter

I am using this package for admob in flutter

admob_flutter 0.3.4
https://pub.dev/packages/admob_flutter

it prints out this:

<Google> To get test ads on this device, set: GADMobileAds.sharedInstance.requestConfiguration.testDeviceIdentifiers = @[ kGADSimulatorID ];

How can I get the test ads appear in iphone simulator for flutter ?