How to change blog name and address?

Change blog name (title)
Please go to settings>>basic>>title.
Make the changes.
Save settings

Change blog address (URL)
settings>>publishing>>Blog*Spot Address
Make changes inside the box.
Save settings

However, please be aware that changing blog address may have adversed consequences:

You may lose 

1. all your followers

2. your blog's established Google ranking

3. adsense earnings
   4. feeds
   5. domains