Display your model in 3D, and make sure the appliance is visible in the view.
Select Edit
> Materials Paintbrush, or click the Materials Paintbrush button
on any tabbed toolbar.
In the catalog panel, select the color or finish you want to apply. You can find an assortment of colors in the Paint category. For the stainless steel look you may want to try the Silver material in the Finishes category.
Click on the appliance component you want to apply the material to. Materials are applied separately to the individual parts of the appliance. For example, you can select a different color just for a knob or handle.
When you are finished applying materials, right-click and select Finish.