how to classify sounds in my Indigo?

[Origami]

I've read the manual, and probably it's a very naive question, but I'm new to the Virus and I just don't know how to classify the sounds into categories. I want to classify them into favourites but I just don't know how. I know how to search the sounds within each category but not how to actually classify them.

help me? thanks...

ah, the Virus I own is the Indigo 1.