I'm not sure if Virtuemart has a module position right where you want to show the social buttons, but if so, I'd recommend configuring the JFBCSocialShare module to display in that position. It's the easiest way to configure all of our social buttons in one spot. It's also possible to modify your Virtuemart template files (which you're editing already) to add a module position so that you can configure the Social Share module there, but that may be a little more complex, and I don't know how to do that off-hand.
Beyond that, if you want to add the social buttons with our easy-tags, you'll need to include each easy-tag. If you're just using {JFBCLike}, then only the Facebook button will show. You'll also want to add:
{SCTwitterShare}
{SCGooglePlusOne}
{JLinkedShare}
For more information on the available Easy-Tags, see:
www.sourcecoast.com/jfbconnect/docs/social-sharing/easy-tags
I hope that helps,
Alex