Click the "Groups" tab on the left hand side bar to open a drop down menu.
Press "List Groups" on the newly opened menu.
This brings you to a List of all Groups you have administrative power over.
At the far right of each listed Group there is status indicator, in order to erase a Group it must be set to stop. Click the status to access the drop down menu.
Select stop then wait a moment for a confirmation message to display above the Group list.
Once the confirmation message displays, click the status again then select erase from the menu.
A confirmation message will now display acknowledging that the Group has been deleted.