Open the site in FP.
Make the change to the include.
Make FP update the pages that use that include:
FrontPage 2002 Tutorials - Adding functionality to your website with FrontPage 2002 Part III ~ Included Content.
To update the included content merely open the include page and edit the contents and save. Next time FrontPage recalculates and refreshes the website all the pages that this include page is inserted on will all have that content updated, saving you hours of time. This is why it is particularly good for customised navigation bars. If you donít want to wait, go to Tools | Recalculate Hyperlinks and a box will appear. Click Yes and FrontPage proceeds with the recalculation.
Upload the updated pages to the web server. You do not have to upload the includes folder. It is for internal use within FP.