When I paste the code into the Custom HTML box of my Tumblr Dashboard and save it, the website looks scrambled and I can see weird code snippets spread across the site. What should I do?
Please make sure to open the main HTML file of the playground theme with a text-editor before copying & pasting the code into the Custom HTML box on Tumblr.
For Windows, you can use Notepad++, which is a free text-editor.
If you are a Mac user, you could use Textwrangler.
Open the main HTML file of the playground theme in one of these 2 applications and copy the entire code before pasting it into the Custom HTML box of the Tumblr Dashboard.