taitava

I'm so confused by this xD I'm in love with the results I saw on the thread for this plug-in, however, I can't seem to be able to figure out how to do this on my own, lol. If somebody would be so kind as to explain to me how to use this awesome feature, it would be greatly appreciated. (i'm trying to change a grey area an amber color, if that helps at all). Thank you in advance!