this is the more technical part of the Message Board. As you can read under the name of this forum ("Website and LttD Updates") you will find here: "Updates and Information related to this Message Board".
The specific thread you are answering to is about the "Who's Online" function, which was disabled for a while but is working fine now.
It can be confusing at first but I'm sure soon you will find your way around here just fine. Best is to pay attention to the short descriptions under each forum's name. They are usually quite helpful!