Accounts.createUser(options, [callback])

var options = {
    username: $('#input-username').val(),
    password: $('#input-password').val(),
    profiles: {
        birthday: $('#input-birthday').val
    }
};
Accounts.createUser(options)

email: email,
        password: password,
        username: username,
        profile: {
            firstname: firstname,
            lastname: lastname,
            twitter: twitter,
            birthdate: birthdate
        }
    });
},

Template.registerUser.events({
'submit form': function(event){
    event.preventDefault();
    var firstname = event.target.firstnam.value;

Meteor.call('createUser', clubName, capacity, description, homepage);
    Router.go('userInfoStep2');
}