Time Dropdown list from script

I need to make a dropdown list with times at 15 minute intervals.

I have a script that I got from another post on here but I don't know where to put it in the dropdown properties to make the drop down list.

Here is the script I found on here:

var times = [];
for (var i=0; i<=11; i++) {
	for (var j=0; j<=45; j+=15) {
		var hour = (i<10) ? "0"+i : i;
		var minute = (j<10) ? "0"+j : j;
		times.push(hour + ":" + minute + " am")
	}
}
for (var j=0; j<=45; j+=15) {
	var hour = "12";
	var minute = (j<10) ? "0"+j : j;
	times.push(hour + ":" + minute + " pm")
}
for (var i=1; i<=11; i++) {
	for (var j=0; j<=45; j+=15) {
		var hour = (i<10) ? "0"+i : i;
		var minute = (j<10) ? "0"+j : j;
		times.push(hour + ":" + minute + " pm")
	}
}
this.getField("Time").setItems(times);