blogger did not have a plugin for it , you can use the code html codes to set the meta tag description, meta keywords tag, register the blog to google webmaster, yahoo webmaster, webmaster bing, for blogs to be more friendly Seo
No plugins for Blogger, well there are plugins, but you don't "install" them through clicking buttons, it's just adding code to your blog. There are ways to enhance your SEO but with the new blogger interface most of it's done pretty well for you.
No plugin for blogger, if you want to add meta tags and meta description. and meta titles for your blog post. Edit manually on every post in template coding. Use this code for meta tags and meta description in blogposts of blogger < b:skin!>[cdata[ Right above this line of code, copy and paste the following (delete the space after the first < in each line): < b:if cond='data:blog.metaDescription != ""'> < meta expr:content='data:blog.metaDescription' name='description'/> < /b:if>