You're currently viewing the Scrollbars code and instruction page.
Step 1. Select and copy the code for the scrollbar below from the code boxes.
Step 2. Now go to the "Customize your blog" in tumblr.
Step 3. Click the "Edit HTML" button or "Use Custom HTML button to the left.
Step 4. Now paste in the code you copied right before the </body> part at the bottom
Step 5. Click "Save" then "Close" in the top left corner and now your new scrollbar is installed!