为Twetwelve主题更改自定义帖子类型的索引Feed外观？ （WordPress的）

Is it possible and how should it be done? My custom post appears and works fine, and i can customize its permalink page but the index page stays the same. I tried making a content-[posttype].php + single-[posttype].php along with amending the get_templatepart code for the single-[posttype].php filebut it didn't have any affect on the appearance of the custom post type when viewd in the main index feed.Is it possible and how should it be done? My cu