1. Go to Template ==> Edit HTML
2. Find the script below
<!-- outside of the include in order to lock Attribution widget -->
<b:section class='foot' id='footer-3' showaddelement='no'>
<b:widget id='Attribution1' locked='true' title='' type='Attribution'/>
</b:section>
3. Replace 'no' with 'yes', 'true' with 'false', save changes
4. go to Layout ==> Edit Attribution ==> Remove ==> Save