This document will walk through removing the colored dome on the Big Button so you can add vinyl underneath it.

You will need a thin prying tool, such as a small slotted/flathead screwdriver or a rigid knife blade.

Put the tool into the gap between the colored dome and the black rim and push it in a bit. Don't apply too much pressure, but press it down as far as it will comfortably go.

Pry the dome gently and it should start to lift up.

Keep prying until the dome comes up far enough up the black rim to come loose.