build.Gradle Project file problem

[Zorphan]

So im up to step3 of Firebase setup.. paste code onto Project-level build.gradle (/build.gradle).. but the file doesnt have Dependancies or Repositorie on the file..

Here is a copy of my build.Gradle Project file..

// Top-level build file where you can add configuration options common to all sub-projects/modules.
plugins {
    id 'com.android.application' version '7.1.0' apply false
    id 'com.android.library' version '7.1.0' apply false
    id 'org.jetbrains.kotlin.android' version '1.6.10' apply false

}


task clean(type: Delete) {
    delete rootProject.buildDir
}

...so where do i paste the file from Firebase? everywhere i paste it, it wont syn. Or have i not set up the program correctly? im using Kotlin


Just so you talented people know .. ive just started Progaming.. today. So if you could explain what im doing wrong and explain your code it would help me learn from my mistakes.. having dyslexia is tough enough lol. Im trying to build a communication app for my son who has mental helath issues.

Thanks for any help