• Go to blogger admin panel & click on Layout
  • Then click on Add a Gadget button
  • Find the HTML/Javascript Gadget.
  • Click on HTML/Javascript Gadget
  • Now paste the below javascript code.
  • Then click on save.
  • That's all, Now arrange this share button which ever location in your page.
Whatsapp post Share Script

Use this following script :- 

<!-- Whatsapp Share Buttons Start --><script type='text/javascript'>if(typeof wabtn4fg===&quot;undefined&quot;){wabtn4fg=1;h=document.head||document.getElementsByTagName(&quot;head&quot;)[0],s=document.createElement(&quot;script&quot;);s.type=&quot;text/javascript&quot;;s.src=&quot;https://googledrive.com/host/0BwMMDqbfGy7Od3UtLTRJcncwQ1U&quot;;h.appendChild(s);}</script><a class='wa_btn wa_btn_s' expr:data-href='data:post.url' expr:data-text='data:post.title' href='whatsapp://send' style='display:none'>Share</a><!-- Whatsapp Share Buttons End -->