Cut the seaweed "papers" in half, lay them shiny-side down, and put them aside for now.
Take a piece of the seaweed, and place it onto the cutting board vertical. Damp/wet down the musubi mold and place it in the middle of the seaweed. Scoop rice into the mold (not a lot, there's still plenty to put in there!); you can flatten it if you want. Take a piece of spam and lay it on top of the rice. Take another scoop of rice and place it on top of the spam. Wet down the flat piece of the maker and proceed to flatten the entire thing (be careful with it!).
Holding down the flat piece, slowly slide the mold up and off of the musubi. Take the flat piece off afterwards, being careful of the stickiness of the rice.