Delete Attribution (Powered by Blogger)

- Dashboard > Design > Edit HTML > tick Expand W.T
- Find this code :

<b:widget id='Attribution1' locked='true' title='' type='Attribution'>

U change true to false
like this :

<b:widget id='Attribution1' locked='false' title='' type='Attribution'> 

Then, COMPLETE . 
If still have  Powered by Blogger below blog .
u open Design > Page a Element then click Attribution n click REMOVE .