When you first create an HTML Help control, it is inserted as an object in your topic (usually in the form of a button). You can easily make changes to the control when the topic is open in the WYSIWYG Editor.
Double-click the control. The dialog for changing the control's properties opens.
Use the available tabs and make your changes.
Tip: If you right-click the control and select Design-Time Control Properties, the control's properties dialog opens. From this dialog, you can change the control as necessary.