Vbulletin decided to take the ignore list feature out of the version of Vbulletin that Ausbb uses(version 3,7) so an addon was needed to put the ignore feature back in

To add a user to your ignore list , click on there name and a drop down will appear , you will then see "add user to your ignore list"

You can add/remove a user from your ignore list by going to your "User CP" a link to your "USER CP" can be found in the navigation tool bar