How To add Meta Tags in Blogger?
1- First of all sign in to your blogger account then go to template section.
2- Before going to Edit HTML menu,click backup/restore option in the top right corner of the page and download the template which is already applied to your blog.
3- Then Edit Html and fine this code:
<b:include data='blog' name='all-head-content'/>
You can find this code by pressing Ctrl + F and paste the above code in the field and press enter.
4- Now above this code paste the following three lines,
<meta content='DESCRIPTION HERE' name='description'/>
<meta content='KEYWORDS HERE' name='keywords'/>
<meta content='AUTHOR NAME HERE' name='author'/>
and replace the blue text with your own description,keyword and author name.
Done...