Hi guys how do I make a script to use with tampermonkey that submits a google login?

I googled and got lots of answers but I don’t know how to make the script work.

<script>
document.getElementById("identifierNext").submit();
</script>

I put the above code into a tampermonkey script and save it but it does nothing, what am I missing to make this script work?

The “identifierNext” is the Id I get when I inspect the element on the google login page.

Any help is appreciated.

<script>
document.getElementById("identifierNext").submit();
</script>