One page checkout Virtuemart uses another Login form not SClogin

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It sounds as if you're just looking to add the social network login buttons to the existing One Page checkout page. To do this, I would recommend doing a template override of that checkout page and adding our JFBCLogin easy-tag to the page. This could be as simple as adding the following:If you'd like to the configure the social login buttons more, please see JFBConnect > Social > Examples section to see more options for this easy-tag.

If this isn't what you're looking for, please explain in more detail what you'd like.

-Melissa