It's not possible to ignore a poster from all parts of the forum, so the feature was removed. There are no plans to reintroduce it.
Thanks for the answer, Pam. I'm not tech-savvy so I can't suggest anything, but I appreciate the fact that you replied to my question.
Admin: "Hm, I was ignoring you so I didn't read your message, sorry."
You should be on the stage. The next one leaves in five minutes.