<script>
function Selected(a) {
var label = a.value;
if (label=="1") {
document.getElementById("Block2").style.display='block';
} else {
document.getElementById("Block1").style.display='none';
}
if (label=="2") {
document.getElementById("Block1").style.display='block';
} else {
document.getElementById("Block2").style.display='none';
}
}
</script>
<label><input class="pick-item__input" id="Dest" name="user" value="Open" aria-required="true" onChange="Selected(this)" type="radio" name="step3" name="ch[]" value="pole1" value="Email" >
<div class="pick-item__label">Поле 1</div></label>
<label> <input class="pick-item__input" id="Dest" name="user" value="None" aria-required="true" onChange="Selected(this)" type="radio" name="step3" name="ch[]" value="2" value="pole2" >
<div class="pick-item__label">2 поле</div>
</label>
<div id='Block1'style='display: none;'>
1 поле
</div>
<div id='Block2' style='display: none;'>
2 поле
</div>