I want to show certain instructions to the admin user after they login to Umbraco.

I have followed the article https://24days.in/umbraco-cms/2015/umbraco-7-back-office-tweaks/ to add a Javascript file that can show a js alert post login.

angular.module('umbraco').config(['$httpProvider',function ($httpProvider) {

    $httpProvider.interceptors.push(function ($q) {
        return {'response': function (response) {

            if (response.config.url.indexOf("/umbraco/backoffice/UmbracoApi/Authentication/PostLogin") !== -1) {
                    alert('TEST')
                    // dialogService.open({template: '/app_plugins/SuccessLoginPopup/successlogin.htm',show: true});                          
                    //$("<div>This is a test</div>").dialog();
                }
                return response;
            }
        };
    });
}

]);

The alert works fine on the above code but the dialogService is not available and shows error.

Is there any solution I can display a nice html popup with instructions to admin post login?

There is Umbraco tours - but thats not usable for me as I want to write some login to the JS code to display various information based on the dates.

Any help would be greatly appreciated