Looks like my web hosting’s broken again. Reposting myguide with Mediafire links so it’s not completely useless. :)
Tips:
Before you replace the sticker on your R4 card, take a picture of it! You’ll probably have to update its software in the future, and it’ll help to know what it looked like.
Print the sticker on glossy sticker paper. I don’t recommend trying to stick normal paper to your R4 card, as the extra thickness could damage the contacts inside your Nintendo DS.
Look for an “actual size” setting when you print, and use the highest quality settings your printer allows.
For extra authenticity, cut off the bottom left-hand corner, and print off the official box art (the PDF comes bundled with the fan translation patch).