How do I delete a Label. When i show all labels I can't delete just look at them
in order to delete a label, please click on the @ link below the search box in the upper-left corner. This will display all existing labels. Now, in order to change a label's name, color or delete it, either click on the gear icon on the right side of each label's line or simply right-click on the line of a label to see the same context menu.
Thanks - feel a bit stupid not finding out myself.....