Copying to your ROM a song available on the Forum

Hey Madsiur, I have been working on this tutorial for the last 3 hours now and have so far successfully accomplished everything up to Step 7 (the game plays the official music, so I must have done something right). However, step 7 is where I get completely lost. It also seems that Mutteo got stuck on this step as well, but I was unable to really understand what you guys were talking about. The instructions are really specific on how to relocate the song pointers and copy/paste the song data - but then Step 7 only tells you how to replace instruments of a pre-existing song. How does my new song find the new instrument data? Where do I copy/paste it to? Do I need to copy paste some instrument pointers like I did for the song pointers? If so, where are they located and where are they referenced?

Sorry for all the questions, but I was doing really well until I got to the instrument step. Thanks!