How do I change the name of a label-How to Edit Label

1. Go to the Posting | Edit Posts tab for your blog.
2. Click Label-1 in the label list.
3. Click Select All to select every post with this label.
4. From the Label Actions... menu, choose Apply label > New Label...
5. Enter Label-2 as your new label. (If you already have some posts with this label, you can simply add that label, without creating a new one.)
6. Now all the selected posts should have both labels. From the Label Actions... menu again, select Remove label > Label-1, and you've completed the switch