Editting the login modal

jaread83- Thanks for providing the details. Yes adding the JS code to header or footer would work. Regarding the login fail state, if there is an error while signing in, a new element is being added to the HTML of login modal.

<a name="feedback-error" li-common-non-bindable=""> </a>

You will need to write a JS code to check, if login modal has this element.

jaread83-
Try the updated code.

$('#lia-body').on('mouseup', '.UserLoginForm', function(e) {
    if (e.target.hasClass('lia-button-Submit-action')) {
        console.log('click submit button');
    }
});

Or if you just want to bind the click event to the sign in button, you can use this code.

$("#lia-body").on("mouseup", ".UserLoginForm .lia-button-Submit-action", function(){
   alert("clicked on submit");
})