Hello, I recently just got a new forum and I'm doing all the edits I want on it. How do I enable for users online to show in my forum. Like here on the support forum: http://prntscr.com/7uhnqi

And if this is a hook can someone please point me in the right direction?

On the left about midway down the screen you should see a >. When you hover over it it says Manage Blocks. Click on that and you will see the option for online users. Drag it out and put it where you would like it to go.