VM custom field

"NEW: VMVENDOR VENDOR LINK IN CART VMcustom plugin (plg_vmcustom_vmvendorincart) Installed successfully. You must create a new VM custom field (type: plugin) with this plugin. It will be automatically added to products on new product additions and editions. It will then display the link to vendor profile below the product name in cart and invoice views."

Can I've step-by-step manual for this?

Well this is related to Virtuemart so you'll have this detailed, in VM documentation.

It is very simple:
- Virtuemart configuration -> Products ->Custom Fields -> New
Custom Field Type: Plugins

Further below you have:
Additional Parameters
Set: VMCustom - Vendor in cart.

Hope it helps

This I understand. My question was more about other check boxes there, like if it's a group, only by SuperAdminister or not & etc.