Silleebear - you have to post in the "call for Judges" thread for the event that you wish to judge. Right now there is only one active that still needs judges. The thread title is "Benton Franklin Fair BBQ Cook-Off- Call For Judges".
When you post in that thread, be sure to include your CBJ#, or if you can't find/don't know that number, your PNWBA Membership number. Also be sure that your PNWBA membership is up-to-date and paid for, as active PNWBA members are given priority in judging assignments.