Cannot install the New Relic agent in the first place

[marlonfrr]

Hello :), I'm trying to use New Relic within my Flutter App so I was following your steps to install de agent first, but in the step called "Start the agent", I don't know where to put this:

• NewRelic.withApplicationToken( "YOUR_KEY" ).start(this.getApplication());

You say that goes in the onCreate method but I don't have such method in my entire application. I have a file called MainActivity.kt (android/app/src/main/kotlin/com/example/APPNAME/MainActivity.kt) but the only method I have here is the following:

Can you help me starting the agent?

Thanks!