thumbnails not showing….must be appearance>editor

why thumbnails arent showing up? there are in the post the options to insert a thumbnail, and i tryed some other things to make it show up but it just doesnt here: https://areafreak.com/ plz heeelp. Ask me if you need more info

here’s how it shows in dashboards…instead of thumbnail it shows a picture from godaddy(my host)
https://img267.imageshack.us/img267/9052/wtfzb.png

and here-s appearance editor :
https://img46.imageshack.us/img46/111/wtfxb.png

i think its from some .php file, not setted right but where and how?

if you want more info just tell me im right here

thank you in advance