Steps to use JFBConnect in Joomla 2.5 w/Login & Register menu buttons

The SCLogin module is a module that you'd need to put in a module position in your template. I'm not sure if there's a module position where the Login and Register buttons are on your template, but if so, you should just be able to enable the SCLogin module in that position.

Beyond that, if the Login / Register links go to the standard Joomla Login and Register pages, you can enable the "Integrate With Joomla Login" setting in JFBConnect to add the social login buttons to those pages.

Finally, if you need to replace those buttons directly, you may need to contact your template provider on how best to do that as they should know that information.

Thanks,
Alex