What these two lines of kotlin code does

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Android

Kotlin

class MainActivity : AppCompatActivity() {
    private lateinit var binding: ActivityMainBinding
    private val myName:MyName = MyName("Kotlin noob")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
        binding.myName = myName //line 1
        binding.doneButton.setOnClickListener {
            addName(it)
        }
    }


    fun addName(view: View) {

        myName?.nickName = nickName_edit.text.toString() //line 2
        binding.showNameTextView.text = "hello ${binding.enterNameEditText.text}"
        binding.showNameTextView.visibility = View.VISIBLE
        binding.enterNameEditText.visibility = View.GONE
        view.visibility = View.GONE
    }

//this is the class used for data 
data class MyName(var name:String="", var nickName:String="")
}

how the commented code work ? i mean in line 1 how are we assigning myName to myName they are the same thing, and how we can assign reference variables to each ?
and in line 2 what is that ? after myName


* i came from a Java background so it be nice if you can explain it with Java example/syntax

What I have tried:

i did some research but it's still ambiguous.