TIA,
The SCLogin module installs with JFBConnect itself. When you upgrade the main component, that will upgrade the SCLogin module.
If you just want to update the SCLogin module, you can use the Joomla Update Manager as well to find and install the update that way. However, we always recommend making sure your component is up-to-date as well.
Hope that helps, but if you need anything else, just let us know!
Alex