With this setting you can order the players in the infochannel by addition (default), alphabetical or by rank in a queue of your choice.
Keep in mind that you need a premium server to order players in the infochannel by rank.
Click on the corresponding setting in the configuration menu.
The next thing you will see is the configuration message with a description, a list and buttons. Click on the one you prefer.
After that confirm the changes and your infopanel will change (here: alphabetical order):