Click on Code and then select the code (Ctrl + A) or (Command + A) and then copy the entire code (Ctrl + C) or (Command + C). Once you have copied the entire code go to your blog and click on Customize from there click on Edit HTML. Now select everything again (Ctrl + A) or (Command + A) and once everything is highlighted press (Ctrl + V) or (Command + V), hit update preview and save!