- Copy the code from the theme’s download page.
- Navigate to your blog’s customize page – located here on your primary blog, and at https://www.tumblr.com/customize/username on any secondary blogs.
- Click the ‘Edit HTML’ button.
- Clear all the code in the ‘Edit HTML’ panel and paste in the new code.
- Click ‘Update Preview’ and then ‘Save’.
- Refresh the page to see updated appearance options.
- Enjoy your new theme!