How to delete a label in blogger or blogspot blog

In summary, if you are using Blogger and want to delete a label you must:
Go to your blog's Posts page in Blogger
Click the check boxes next to each post that contains the label you want to delete
Then, click on the label inside the "Label Pull-down menu"
If the label is already on that post, it will be deleted. (if it is not there it will be added)

Or, if you want to change a Label, you must

First add a new label to all the posts to be changed
And then, you must delete the old label using the method described above.