Add Meta Tag In Blogger

1.Sign in into your blogger blog and click on template
2. Now select EDIT HTML 

3.Now find this code (press CTRL + F )

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

4. Now add bellow code just after the above code see in the figure.

<meta content='your description here' name='description'/>
<meta content=' your keywords here' name='keywords'/>
<meta content='your name' name='Author'/>
<meta content='your email address' name='Email'/>
<meta content='global' name='distribution'/>
<meta content='5 days' name='revisit'/>
<meta content='5 days' name='revisit-after'/>
<meta content='document' name='resource-type'/>
<meta content='all' name='audience'/>
<meta content='general' name='rating'/>
<meta content='all' name='robots'/>
<meta content='index, follow' name='robots'/>
<meta content='en' name='language'/>
<meta content='IN' name='country'/>
<meta content='blogger' name='generator'/>

Now add description , keyword , your name and your email address and just click on save and you have done !