I need to delete 1 of 2 domains

I have an old domain https://www.burydepression.com that I want to make go away completely. I only want to use a new domain https://www.anewcountry.com . Right now when I post to anewcountry.com, it mirrors the posting to burydepression.com. I’ve searched forums, watched Youtube and spent hours playing with wordpress, but can’t solve this one riddle. Are you able to share some insight?

The page I need help with: [log in to see the link]