There are plenty of blog posts explaining how to add Twitter Card integration to your Blogger posts but I haven't seen any that are written for the newer Blogger UI. The code that does the integration hasn't changed since this article in 2013 , but the steps to add it to your theme have. If you haven't logged onto Blogger, do so. You should see this panel on your left. Pick "Theme" and you will see something that looks like this on the top portion of your screen. First things first, make a backup. Click on the little arrow If you are using the classic themes, it will look like this. After clicking on the arrow, pick Backup. Download the file. It's the same for classic themes. Pick download. Save the file somewhere just in case you need to recover your theme. While editing your theme will not destroy any of your pages or posts, it can cause problems for the theme you are using if you make a mistake. If you've spent some time editing your blogroll and cust