Add custom color field to a product page to choose from

Hey folks, I would really appreciate your help in WF Ecommerce. I would like to attach a color value to the order for each product that the user picks up with a click. I couldn’t modify the color option value (what I can see in general after the order placed). Do you have any idea how can we solve this?

Here is my site Read-Only: LINK
(how to share your site Read-Only link)