Background: If someone posts an entry marked "private" to a community, the entry can't be edited by the person that made it even if it was the maintainer that posted it (which makes sense, its "private" to the community), nor can it be edited while logged in as the community, it can only be deleted.
The FAQ says:
If an entry does not appear in the subject listing, its privacy level is probably preventing you from seeing it. Make sure you are logged in, are a member of the community, etc. If the entry is private, you'll need to know its item ID.
This is misleading. If the entry is private, editing it isn't possible. Even if you know the item ID. You can delete it, but no editing, nu-uh.
I suggest modifying those sentences to instead read:
If an entry does not appear in the subject listing, its privacy level is probably preventing you from seeing it. Make sure you are logged in, are a member of the community, etc. If the entry is private, you'll need to know its item ID, and you will only be able to delete the entry, not edit it.