The Attribution gadget is the gadget in the footer that says "Powered By Blogger". If you have tried to remove this then you may of noticed this gadget is locked into you blog. To unlock it, follow the next steps:
Step 1. Log in to your Dashboard, go to Template > Edit HTML
Step 2. Click anywhere inside the code area and press the CTRL + F keys to open the Blogger' search box
Step 3. Type or paste the following tag inside the search box then hit Enter to find it:
</head>Step 4. Just above </head> add this code:
<style>Step 5. Click on the Save Template button to save the changes.
That was all !