There was a problem.. generic child variant custom field on category page

[fale]

Hello to All !!!!

I do not understand how to add children to the category.

I do not have a button for selecting child products.

Do I need to modify the code? I added an image of my problem to the attached file. This is a screenshot from the site http://demo.virtuemart.net/product-variants



Can someone help me?

[K&K media production]

https://www.youtube.com/watch?v=2_TdolGg9rY

+

Configuration -> Shopfront -> Product Listing -> Show product customfields in browse views

[fale]

Thank you. I have such a setup. But - I see what's on the second image.  There is no button for selecting a child. I can not choose a child product from a category view.
Choose variant - not clickable
VirtueMart 3.2.2

[K&K media production]

Maybe no existing / enabled childs?