// 1. Acquire a reference to our 
.
//    This can also be done by setting :
//       var form = document.forms.blub;

var form = document.getElementById("myAwsomeForm");


// 2. Get a reference to our preferred element (link/button, see below) and
//    add an event listener for the "click" event.
document.getElementById("your-link-or-button-id").addEventListener("click", function () {
  form.submit();
});

// 3. any site in your javascript code:
document.getElementById('myAwsomeForm').submit();