Where labels have been configured by your site administrator for a group of map features or layer, you can activate labels and change how they display by following this procedure.
Depending on the data source of the map, label properties may not be available, and you may be limited to being able to turn labels on or off for the layer.
2. In the Layers tab, click the Layer Options button for a layer.
3. In the Layer Options drop-down list, select Labels in the shortcut menu that appears, and then select Labels On.