use checkbox to show button

You want to show a button when a checkbox was checked?

When do we know, if a checkbox was checked? Perhaps when some changes were done the first time, right? That means…

$w.onReady(function () {
  $w("#checkbox1").onChange((event) => {
    let isChecked = $w('#checkbox1').checked;
    if(isChecked===true){
      //usecase if checkbox is checked
      console.log("Checkbox is checked")
    }
    else{
      //usecase if checkbox is unchecked
      console.log("Checkbox is unchecked")
    }
    console.log(isChecked)
  });
});

You will get the result in the CONSOLE. Use the console to see it.