Auto Enter Input

HTML

<form class="_k3t69">
    <input type="text" class="_7uiwk _qy55y">
</form>

<form class="_k3t69">
    <input type="text" class="_7uiwk _qy55y">
</form>

<form class="_k3t69">
    <input type="text" class="_7uiwk _qy55y">
</form>

JavaScript

var form  	= document.querySelectorAll("._k3t69");
var input 	= document.querySelectorAll("._7uiwk._qy55y");
var message = "Replacement..." ; 
var maxMsg  = 3 ;
var delay 	= 2.5 * 1000 ; // 2.5 Seconds

var j = 0, k = 0;
function setValue(){
  if( j == maxMsg || j == input.length) {
  	clearInterval(looping)
  } else {
		input[j++].value = message ;
    //And then simulate pressing enter key ON THE INPUT, not sumbit the form
    form[k++].submit();
  }
}

var looping = setInterval(setValue, delay);