You don't 'click on' a button, you 'click' or 'push' it. It's a button. There's no need to change the cursor to let you know that you can actually click on it.

You don't 'click on' a button, you 'click' or 'push' it. It's a button. There's no need to change the cursor to let you know that you can actually click on it. That's the reason hyperlinks use the hand.