If you already have Google Analytics for your Strikingly page set up, you are ready to see the data for your blog posts.
To set up Google Analytics for your Strikingly page and blog posts, go to the Google Analytics site! GA can give you more information than you'll need, and they are very stable -- they are free as well unless you use their ad services.
Get your code to verify your site and add it in the site editor's Settings > Show Advanced > Services > Google Analytics Tracker. Don't forget to re-publish your website, then go back to GA and make sure your site is verified. You'll be good to go!