First you need to load the machine where you want to use the presets for. Next open the paramter window of the machine by dubble clicking on the machine or using the right-mouse button menu. When you are in the paramterview you need to click the "Edit" button. When you are not seeing this, you are using an old version of Buzz.

When you clicked the edit button in the parameter view, you should get a window like that window on the left. Click on the import button and select the preset for that particulary machine and open it. The presets are now added.