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Is there a way I can modify change a template web page?
Hi Diane S,
This is Jonis from Microsoft Online SharePoint Support.
Once you create a Web page or site from a template, changes to the template will not change sites already created from that template.
In order to modify/edit a template, start with a page created from the template, modify the page to fit your needs, and then save the page as a new template. The following links detail the process.
Save a public-facing webpage as a template
Save a SharePoint Online site as a template
If that does not answer your question please let me know as I will continue to monitor this thread for any additional posts or questions.
Microsoft Office 365 SharePoint Support