I have problem custom fields

[fr_sdgh]

hi, I don't know where my previous post went! so... I have problem custom fields, Unfortunately manual docs not completed http://docs.virtuemart.net/manual/17-products-menu/38-custom-edit.html and I don't khow how it works 
I need to like as http://test3.breakdesigns.net/index.php/component/virtuemart/apparel/t-shirts/men-s-sport-t-shirt-detail

plz apprehensible talk to me because not good english