Welcome to the community Shrela. We hope you enjoy your stay. [honesty]
MsOz... Shrela is talking about a tute that is no longer posted on the site but instead only offered as a download. It was the very old "Sessions" section of the "Experienced User" section.
Shrela... the very next sentence right below the one you posted "It looks all dusty and scratched.", holds the answer to your question...
"There is a simple way to fix this (if you don't want it that way), and here it is... READY?!... Click on the 'Surface 1' layer, and return its Opacity setting back to 100%. Simple huh?
"
I'm not sure how you missed that though.

But it doesn't matter in any case. I hope that satisfies your obsession. [righton]