DT Post Image is a widget to show your blog’s post image on widget areas. The post must have a featured image to make the post appear in the widget.
here’s how DT Post Image looks like on Appearance > Widgets
You can choose which post category you want to show in DT Post Image by ticking one of those category’s post. after you finish dont forget to click Save and it will looks like this on your website :
when you put click it it will take you to the post.