How to remove footer(Powered by….) in blogger:

1. Go to Design--> Edit HTML.
2. Expand your Widget Template.
3. Click Ctrl+F for the browser Find bar to pop up.
4. Find the Below Code and Delete it…

  <b:section class='foot' id='footer-3' showaddelement='no'>

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

<b:includable id='main'>

    <div class='widget-content' style='text-align: center;'>

      <b:if cond='data:attribution != &quot;&quot;'>

        <data:attribution/>

      </b:if> 

    </div>

    <b:include name='quickedit'/>

  </b:includable>

</b:widget>

</b:section>

5.If you want to add custom footer add Gedget at footer and choose html/JavaScript  gadget

  Type your require HTML code there.