In fact you cannot rename a label in blogger, but you have to remove it from all the post and add the new name. Check out the link below to do it in very simple steps

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Change the name of a label – Blogger Help: Let’s say you have a number of posts with the label Hawaii but you’ve decided that you’d rather call it Vacation instead. You can’t edit the name of a label directly, but there’s a simple workaround to accomplish your goal:

Labels are the only way in Blogger to categorize a post. Here we cannot create sub-categories / labels like we have in other platforms like WordPress. Joomla, etc, but still Blogger is a wonderful free blogging platform by Google.

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