Under the post there's a "more" button behind which you can find a "report" option. I assume this goes to the moderators of the magazine, but not entirely sure.
In the site's footer, there's a Contact link if you need to report something to the instance owner directly.
And of course you can just message or otherwise contact your instance's owner, in this case Ernest. There's a Send Message button in the sidebar when viewing profiles.
lemonflavoured
shepherd