The SCLogin module is just that, a module. Joomla doesn't let you create menu items to modules, unfortunately. We'd have to create a separate component in order to allow it to be added to a menu item. We do have plans to do something like that in the future, but for now, it's simply not something that's possible using standard Joomla features.
Sorry for the inconvenience, but if there's anything else we can help with, just let us know.
Thanks,
Alex