Ubercart

I wanted to add free tagging but what happens is that the category list terms disappears in "Add a product" and the page is created in navigation menu. I would like to make it in a separate page where I can define products by color, shape, price, etc. Any help will be appreciated.

I'm newbie to both drupal and ubercart. To tell you the fact, I turned to drupal only because of ubercart.