The Remixer generates "transcluded" pages that mirror the original primary content. To edit the content on the new Remixed page, authors have to either edit the original material (e.g. with errors) or have to "fork" the page to copy the content from the original master page into the the new Remixed page.
When and How to Edit Original Page
Except for pages that you created only administrators and developers can edit the original pages on the Bookshelves or Campus Bookshelves without special permission. If you spot an error that needs to be corrected or believe that the text in the original page can be improved please contact firstname.lastname@example.org first for permission to edit the original page to fix mistakes, improve language, fix formatting, or other things that don't change the meaning or flow of the original page. Remember, others may have remixed from those pages and if they are changed their text will also change.
If you have permission, to edit the original page, first edit the transcluded page and you will see a screen like this:
Double click on the "Content Reuse" box so this box pops up:
Copy the link in the box "Article to reuse" and paste it into the browser address bar. You can now edit the original page. Use the browser's back button to get back to your remix when you are done.
When and How to Create a Copy of the Original Page to Edit
If you are altering the content of the original page to fit into a different flow than the original book, changing the pedagogy of how the material is presented, deleting subsections, or otherwise majorly modifying the original, you will want to "fork" the original page. Forking a page creates a copy of the original page in the new location that is completely independent of the original and you can edit it as you see fit (without affecting the original source page).
The easiest way to do this is with the "Forker" which works automatically by pressing the icon next to the remixed (and transcluded page). Then authors can edit the remixed pages without affecting any other page on the platform. The downside is that any upgrades to the Master content will not be reflected in these forked pages.
How to Deal With Attributions on Forked Pages