First-mag small issue

Hello,

On my website i am having a small issue. On the buttom there is a small text “http://tjekfilm.dk/wp-admin/theme-editor.php?file=front-page.php&theme=first-mag” that I dont know how to get rid off.

Anybody knows how?

Website: tjekfilm.dk