meteor.signin.html

<template name="SignIn">

    <form action="/signin" id="signInForm" method="post">
        <input id="signInEmail" type="text" name="email" placeholder="Email Address">
        <input id="signInPassword" type="password" name="password" placeholder="Password">
        <input class="btn-submit" type="submit" value="Sign In">
    </form>
    <!-- end #sign-in-form -->

</template>

meteor.signin.js

Template.SignIn.events({
    'submit #signInForm': function(e, t) {
        e.preventDefault();

        var signInForm = $(e.currentTarget),
            email = trimInput(signInForm.find('#signInEmail').val().toLowerCase()),
            password = signInForm.find('#signInPassword').val();

        if (isNotEmpty(email) && isEmail(email) && isNotEmpty(password) && isValidPassword(password)) {
        
            Meteor.loginWithPassword(email, password, function(err) {
                if (err) {
                    console.log('These credentials are not valid.');
                } else {
                    console.log('Welcome back Meteorite!');
                }
            });

        }
        return false;
    },
});