The only file I changed was in /public_html/templates/hera_j3_vm3/html/com_virtuemart/cart/default.php. At line 223, I added the second call to show the JFBCLogin easy-tag for an empty cart.
Hi Melissa, thank you for your help. Now everything works fine. on my website Login and Registration are now to be entrusted to JBFConnect. I will do some graphic adjustment, but I tell you that I am very satisfied.