This is an old revision of the document!
This displays the current group members of the selected repository (the one you clicked on the repository list on the left). Of course, if you are NOT the repository owner you will never get this repository list.
There is another way for refreshing this list: If you are a manager, you can click when this list-box is empty. It will then ask for the name of that repository whose members you want to see in the list. Give only the repository name for which you are the manager.
In short only owners or managers can see the list of members. This is very useful as non-owners cannot meddle (add or remove) with the membership.
Right-click with the mouse here to clear the list.