Chnaging the "MY SITE" location

[Todd]

How do you change the "MY SITE" location when I open or save a Word document?
Example: When I open a Word Document I pick open from the pull down menu.
That brings up a dialoge box to pick a file. In the bottom right I have a
"MY SITE" button. I pick this and it goes to an old SharePoint Site. I want
to change the path to go to my production Sharepoint site. How do I do that?

Thanks