what is mean by label categories
label is widget which is not added and we have to add it manually.it help to divide our content in to different parts like category. As you can see in image the how label make category there are different labels in the image like facebook
adding label in blog
adding label is very simple just login to your account and go to your blog and now go to layout there you will see a blue colour text written add a gadget so press it and add label gadget.