Instructions
Launch your Web browser and navigate to the LEGO customer service page.
Type "7638" into the "Quick Search" box and press the blue "submit" button immediately to the right. A new text box will appear at the bottom of the page.
Click the second entry in the new text box. The entry should end with the letters "NA."
Click the "Download" link that appears immediately beneath the text box. The instructions will appear in a new tab if you are using Google Chrome. Otherwise, you will be prompted to save the instructions as a PDF file to your hard drive.