How to edit Taxonomy page

Hi I created four product categories using image element at my home page, and set the image linking setting to a portfolio entries. When I click the category image, it leads to that portfolio category, but its layout is tree columns. And where I can edit the portfolio category??
I tried to enter into portfolio items — portfolio categories, and edit the category, but there are only items of “name”, “slug”, “parent”.

Please refer to the link I provided as private content.