WPS Hide Login is a simple plugin that comfortably lets you change the URL of the login form page to anything that you desire. However, it does not rename or change files in core, and neither does it add rewrite rules.
What it does it intercept page requests and it works on any WordPress site. As a result, users cannot access the wp-admin directory and wp-login.php page. So, you should be able to bookmark or remember the URL.