Stuck on a tutorial trying to mask out a logo…

Every tutorial on YouTube sucks garbanzo beans. Anyways, following this tutorial:
and in fusion when I polygon a separate part of the logo that’s supposed to be a different color, I go edit that background and glow color under a new set of nodes and it changes it for the entire project! Why????
I also can’t see the project at all when I drag the media out into the viewer. Only time I see my line of work is in the individual background nodes. They don’t even show them together even when used with a merger. I’m so lost.

I also can’t see the project at all when I drag the media out into the viewer. Only time I see my line of work is in the individual background nodes. They don’t even show them together even when used with a merger. I’m so lost.