I go to add it - and I see "Already Added" - but where is it?
The first thing to check, when this happens, is the "Show pages as" option in the dashboard Pages display. Sometimes, you'll find "Don't show" selected. Other times, you'll find "Top tabs" - but the template may lack the code which houses the "Top tabs" gadget. This will be a problem for older templates, installed before the Pages index gadget was offered - as well as some third party templates.
Try selecting "Side links" (or change from "Side links", to "Top tabs", and back to "Side links") - and see if the gadget shows up, in the sidebar. Each time you change the setting, hit "Save arrangement".
After each change, view the blog, to verify success. Remember to clear cache, and restart the browser, each time you view the blog.
Once you get the gadget to show up in the sidebar - and if it matters - change the option to "Top tabs", and see if it shows up there. If not, you'll have several options.
- If the template came from a third party, change back to a standard Blogger template.
- Upgrade the template, to a newer version.
- Set the Pages Index back to "Side links".
- Reset the widget template.