Follow this link. On the right hand side you will see a box that says “domain” and beneath that “exploding-heads.com” underneath that there is a box with a link to subscribe and a symbol to block. Click on the symbol to block.

Moderation has not caught up with kbin’s growth, despite the devs being very busy. Maybe it’s best just to block for now. I’m sure that kbin will take out the trash once moderation tools and mod teams are in place.

On edit: These instructions won’t work for you, because as @vaguerant pointed out, you are not on a kbin server. However, I’m going to leave the comment up for any kbin users who might want to block that instance.