Hi Mike,
This is an Excel newsgroup, and from the sound of your post,
the button is in another application, is that correct? And if so
what application.
Generally you would go to Customize which you might get to by
rightclick on the toolbars, or first level down from one of the menu button.
In Internet Explorer it is two levels down from the View menu
View, Toolbars, Customize
in IE if you change your toolbars you probably have to Unlock them first
with the menu just above Customize, when finished making changes
lock your toolbars again to help keep someone else change your
settings from their web page.