How To Create, Delete, and Change Labels in Blogger?

Maintaining a logical category structure on a blog is extremely 
important, as it not only helps keep things organized, it also helps 
with user-friendliness. A category navigation makes it easy for users to
 find your articles, and also helps them discover similar titles on your
 blog. In Google Blogger, categories are named Labels, whereas in WordPress, category navigation
 is maintained by Categories as well as Tags. Managing Labels in Blogger
 isn't as straightforward as in WordPress, but it is fairly simple. In 
this post, we'll look at how to create, edit, or delete labels in Blogger.
If you've spent any time working in WordPress, you will know how easy it
 is to create, edit, or delete Categories and Tags from the admin panel.
 But assigning those categories and tags to posts is another matter, 
which is where Blogger scores. Even though Blogger doesn't have 
straightforward controls for creating or editing labels, it uses a 
pretty slick and easy implementation for them, making it very simple to 
assign/un-assign labels to individual posts.
Managing Labels in Blogger
Creating a new label
When writing a blog post in the Blogger Editor, you have a Label section
 on the right sidebar where you can assign that post some labels. 
However, that is only useful for a single post. What if I wanted to 
assign a label to multiple posts?
To do that, go into your Blog Dashboard, and click on Posts on 
the right sidebar. When you see a list of all your posts, you can select
 multiple posts by checking on the box on their left. Now, click on the 
Label action button on top of the list of posts, and choose a label to 
assign. Alternatively, you can create a new label.

The label you create or select will be assigned to the selected posts. 
If that label was already assigned to a selected post, then it will be 
unassigned.
Editing a label
Unfortunately, you can not edit a label in Blogger the way you can edit 
tags and categories in WordPress. But that doesn't mean you can't get 
the job done. If you want to rename a certain label, then simply select 
all posts from that label, and change their label. To do this, first get
 a list of all posts under a certain label by clicking on the Label 
selection button on the top-right.

So suppose I wanted to list all posts with the label "blogger tricks". I
 will simply select that particular label from the selection button.
Now, to change a label, select all posts under that label, and assign 
them a new label of your choice as we discussed earlier. Once this new 
label has been assigned, select all the posts again, and unassign the 
previous label by clicking on the Label action button, and clicking on 
the label you want to remove from those posts. As described earlier, 
posts that already have that label will get unassigned to that label.
Not the slickest implementation to be honest, but it does the job.
Deleting a label
Blogger manages the creation of new labels, and deletion of unused 
labels by itself. So if no posts are assigned to a label, it will be 
automatically removed. 
Be careful though...
Assigning posts to a wrong label could mess things up pretty bad, and if
 you have a lot of posts selected, you will have to manually pick and 
select each of them, and then reassign them, which could be a real nasty
 job. So double-check before assigning a label to a large selection of 
posts.
Also, Blogger doesn't really handle a selection of more than 50 posts 
well, and will mostly generate errors if you try to change labels for 
more than 50 posts. So make sure each selection of yours isn't above 
that limit.
In the end, I would just like to say that despite their differences, 
Blogger and WordPress could really learn a thing or two from each other 
about category management. If I were to design a platform of my own, I 
would take the flexibility of WordPress, and add to it the simplicity 
and ease of Blogger to create a remarkable management tool :)
Got any questions? Feel free to ask in the comments section below. Cheers :)