For those of 당신 who have a tumblr, could 당신 help?

I'm trying to add an SCM 음악 Player thingy to my blog, and I've already copied the code from the site and I know 당신 have to paste the code in the "Edit HTML" box in "Customize" but where? There's so much text and I don't know where to paste it so that it will work properly.