It seems like sometimes I can edit documents and discussions created by others but other times not. Is there reason why?
I believe the issue here is that there has already a reply to the discussion, so the original question can no longer be edited.
If you are a moderator of a space or group then you will have the ability to edit another persons post.
Robert is correct on this one. Any content within the group that you are an administrator over you would have moderator rights to. Another case would be if the document does not have an author restriction on it, then you could edit it like a wiki.
I don't see how to a post made by another administrator of our GeoNet Group. I want to add a tag and change the title. Here is a screen capture of it:
Retrieving data ...