There was absolutely nothing to it; I installed the module, went to the plugin manager and enabled it.
At first, it was only showing on the home page, but as soon as I went into the login module and enabled visibility on all pages, that problem was solved.
Kudos to the developer(s) of this module. As a newbie to building websites, it's exactly what I needed... something simple! Methinks I'll use it on every site I create. Oh, and thanks for making it free.