What you show is for VST instruments that you play, not Soundpool loops. Song Maker uses Soundpool loops. What shows up in the Arranger for instruments is just the name of the type of instrument used for the Soundpool loops on that track. This is not an instrument that you can play.
After you've created a song, scroll down in the Arranger and add an instrument - not a loop - and the interface for the instrument will open.