Quote Originally Posted by Ayrolen View Post
In your UserCP on the left hand side there is a link to "Edit Ignore List." You add a forum name to it and Update/Save (can't remember exactly what it says). It'll put the name at the top of that page with a check mark. If you want to take them off the ignore list, you uncheck and update again.
Also you can click on the poster's name then click "View Public Profile". From there there is a down arrow next to "User Lists" and click "Add to Ignore List".

The easiest for me is to hold down SHIFT when clicking View Public Profile to open the profile in its own window and then just close the window once done.