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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 it can be removed. Just go to:
- Design >> Page Elements, click on the edit link from Attribution gadget:
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- Then click on the Remove button - as you can see in the screenshot below:

That was all !