You can not edit the terms of service or another static page because the Manage button is missing.
These pages are static content, and are not editable modules.
- Log into your DNN site and click Admin>Languages.
- At the bottom of the page, there is a table labeled Cultures.
- Under system, click the pencil to edit.
- Using Control+F you can search for the page name you need to edit and edit it from this menu.