I inadvertently ignored a user and want to undo it. How is that done?
Click on your "mail" tab, then go to your "ignore list" and finally just hit "remove" on anyone you want to "unignore"
It's very simple to do, but hardly that simple to figure where to start. I had the same problem a year or two ago, I had no idea I had the poster on ignore until I saw his board posts were being ignored.
I have never used the ignore button on purpose (I think it's a silly thing anyway, as it is easy enough to ignore someone by simply by not clicking on their posts) but I have ignored a lot of folks accidentally including myself! When you are using your phone to post, the "reply" "quote" "report this post" and "ignore" buttons are pretty close together and with a sensitive touch screen, it's super easy to hit the wrong one.