The Change Logs tab shows you a list of all actions performed in the selected group.

Here is an example of the All Groups page, table view:

Click on the detail line of the group you wish to work with. We clicked on the first group, All Kims (blue box in image above).

The screen will refresh to the details page of the group whose detail line you clicked (blue box in image below

Notice that there is a row of tabs (yellow box in image below). Click on the Change Logs tab.

You will see the Change Logs View. Each message shows the Action, Date, Time and User who made the change.