This tutorial shows you how to remove "Powered By Blogger" Attribution in the footer. If you have tried to remove this then you may notice that this gadget is locked into you blog.
To unlock it, go through these steps:
Step 1: Log in to your Dashboard, go to >> Design >> Edit HTML
Step 2: Check the "Expand Widget Templates" box
Step 3: Search (CTRL+ F) for this code:
<b:widget id='Attribution1' locked='true' title='' type='Attribution'>
Step 4: Replace true with false
Step 5: Save Template
Now attribution gadget is unlocked and you can remove now. Just go to:
Design >> Page Elements, click on the edit link from Attribution gadget then remove it.