When you click the Ignore button in the drop down list from the forum, you must confirm the action by scrolling down and click "add ignore" when it redirect you to the friend list. Otherwise, the ignoring isn't successful.
When you ignore someone, they can still see your messages and posts you've made (either to them or on the public forum). They just can't contact you, post in threads you created, and their posts can't be seen by you.
To un-ignore someone, head over to the "Ignore List". Check the box and click "remove" or something similar to that.
well the thing is I've ignored 3 people but they arent on the ignored list, I guess I'll double check to make sure I ignored them but I'm positive I ignored at least one of them cause I was mad enough to make sure at that time that they couldnt post on my thread any longer.