Monitoring through effects

On page 211 of the manual there’s a picture of the Master Section with effects.

http://download.steinberg.net/downloads_software/WaveLab_Elements_9/9.0.0/Documentation/WaveLab_Elements_9_Operation_Manual_en.pdf

Click on Effects at the top of the Master Section to expose the slots to add effects. You can also add effects in a Montage, but start with the Master Section. See page 188 for Montage effects.