The Load and Save buttons are located on the WaveSystem toolbar, available at the top of each plug-in's interface. There are two ways to save and load presets:
Put Into Preset Menu As will save your preset as an *xps file at:

OS-X: Mac HD> Applications > Waves > Waves Plug-Ins > Plug-Ins Settings.

Windows: My Computer > C: > Program Files > Waves > Plug-Ins > Plug-Ins Settings.

Presets saved using this method will appear at the bottom of the Load menu, under User Presets.


Save to a new file will save your preset as an *xps file, which can be saved at any location on your HD. In order to reload this preset, click on the Load button > Open Preset File, and locate your file.