How to enable “Add a Gadget” link in the Blog Posts section and Header

1: Sign in to your blogger account.

2: Go to Dashboard → Template and backup your current template first.

3: Then click on 'Edit HTML' button and find below code in your template.(Tip: Use Jump to Widget option)

 <b:section class='main' id='main' showaddelement='no'>

<b:widget id='Blog1' locked='true' title='Blog Posts' type='Blog'/>

</b:section>

4: Now change above code with necessary items.A modified code is in below.

<b:section class='main ' id='main' maxwidgets='12' showaddelement='yes'>

                            <b:widget id='Blog1' locked='true' title='Blog Posts' type='Blog'/>

</b:section>