HOW TO ENABLE META TAG TO YOUR BLOG [GOOGLE BLOGGER]
After doing that you are ready to add Meta Description to your blog's posts. This is very simple.
During write new post, now at the right side you will see an option named "Search Description" which you never saw before.
Therefore, now you can easily add search description for each of your blog's new posts. Also if you've time then update the older posts and add up to 150 letters to each post.
Warning : Note that, the description you will use should be different than post title and should have a brief summary about the post. This will increase your visibility to search engines.