Well, creating a meta description for your blogger template would help boost your SEO (Search Engine Optimization) as it is one of the prerequisite for a website. By default, this is disabled on blogger, so you have to add it normally to your template. Creating a Meta Description on Blogger is simple.

Step One
Click on Settings ===> Search Preference

Step Two
Once on the set search preference page, you can can enable the meta description if it is already disabled. Click Enable if Disabled.

Step Three
Enter the description for your website which would be reflected on search engines.

Step Four
If the meta description do not display, you may need to manually add it your template by editting under setting (Template ===> Edit HTML)

All you need to do is to add this to the header

http://www.clarkegilbert.com/2015/08/adding-meta-description-to-blogger-for.html