How do I open the keyboard button?

Excuse me, could you please clarify what you mean by "opening the keyboard button"? Typically, a keyboard button is not something that you can open in the same way as a container or a door. Are you referring to a specific type of keyboard, perhaps with a removable keycap, or is there some specific functionality or feature that you're trying to access? Could you provide more context or details about what you're trying to achieve, so I can give you a more accurate answer?