If you'd simply like your customers to be able to log into their accounts, you can do so in one of two ways:

1) Create a new web page on your site and embed this code into a new page

<div id="myss_login"></div>
<script type="text/javascript">myssApp.View.PlayersClub.LoginView.getPublicLoginView('#myss_login');</script>

2) You can also provide a code on the end of your existing URL (?myss_source=login) if you please and the screen will appear in a modal automatically.  An example would be: