FAQ 119: How do I edit or delete an entry in a community? is missing an important piece of information. It says that "You can edit or delete any community entry that you posted.", but this is not actually true. You also need to have posting access to the community in order to edit/delete a community entry. So, I'm proposing changing the first sentence to:
You can edit or delete any community entry that you posted as long as you currently have posting access to that community.