The content on linked pages are sourced from a central documentation library and cannot be edited.
If they are unlinked from the source, any updates to those instructions that are released in future versions of the documentation will not be reflected in your version.
You can identify a linked page because when you try go to the Page Editor, a bar appears at the top saying, “Distributed from Doc Central. The original will update this version unless you unlink from original.”

If a linked page is unlinked in error, no worries! Simply click on restore it in the same area:

If you need block tutorials added to the Unit Admin Guide, please contact UMC for assistance.