Could you at least try to use the knowledge you already have?

I don't know Processing Layers, but there is a simple and natively available thing named PGraphics which can be used quite efficiently to make layers.

Processing Layers is a contributed library that has not been updated since April 2011. The last available version is for Processing 1.5 in which case you might experience problems using it with PS2. Have you tried any examples that came with the library?

The website has an email address for the creator so you might ask him if he intends to update the library. If more interest had been shown in the library some other developer might be persuaded to have a go at updating it.

Otherwise you will have to use createGraphics() to create your own 'layer' and use beginDraw()/endDraw() to surround any drawing statements for a particular layer.

@GoToLoop I am very sorry that I didn't include what I already figured out! It wasn't very much, though. I couldn't find many tutorials on how to use it and I was confused on how a fair amount of things were used or included, so I was more looking for a tutorial (but couldn't find any). I should have been more specific in what I was asking, sorry.