Add Meta tags to your Blog

Open the Blogger.com

Login In Your Blogger Account .

Go to Design (Layout) > Edit Html > And Mark the box  "  Expend Widget Templates "

Then Find In Your Blogger Html :

"<b:include data='blog' name='all-head-content'/>"

 After You Find it Then You have Add to this line Below

<meta content='DESCRIPTION HERE' name='description'/>
<meta content='KEYWORDS HERE' name='keywords'/>
<meta content='AUTHOR NAME HERE' name='author'/>

Now You can Save changes and You Have Shown the Changes In Your Preview .