Old browsers don't work with newer features. 3D printing from web browser is awesome new technology and it depends on some other awesome new web technologies. Please use one of these supported browsers:
by Opera Software
version 4+ (depends on graphic card)
version 5.1+ (configuration needed)
Follow those steps
Select prefered shape.
Hover over pattern, click a dot and then another one.
Choose material and finish.
Materialize your creation with i.materialise service.