How do I completely remove pop-up from swicalicistable.com on my MacBook Air?

I'm also receiving from swicalicistable.com> this message: "Security Alert You've visited an illegally infected website." I followed the directions for stopping the pop-ups, but when I tried to remove them, it didn't work. I only clicked deny and block for most of them and luckily I haven't gotten any pop-ups, but I want it completely off my macbook. Is there a way to fix this?

[Re-Titled by Moderator]