In the freeware windows version labels disabled. Why?
Considering information on the site labels have to be enabled.
In the free version, you can use labels on the web. To do so, type @home or @work within the task's name to set a label. You can also search for labels and click on them to view all tasks with that label.
What you can't do (as that's the Premium feature) is to view the full list of your labels and color-code them.