If you want to change the text it displays, double click on the button in the form designer and it will create an event handler for you. Inside the event handler type:
theNameOfYourButton.Text = "The text you want to show on the button.";
You need to learn the basic terminology of programming or post your source code and requirements before we can help you. Your question makes no sense.
Good coding involves knowing one's logical limits and expanding them as necessary.