The "ignore poster" feature can be accessed by clicking on the poster's name. That will take you to their information page. You can find the "Ignore Poster" link to click on the left side, underneath their avatar.

For those who may be new to this board, we rarely delete posts so sometimes obnoxious posts remain when they don't rise to the level of actual attacks on a poster here. When someone does that consistently, the best tactic for other members is the "ignore poster" feature.