I have an iMac with 2 user accounts and I want to share a folder between them. I have gone on to system preferences>sharing and turned on file sharing. I have also got the 'Get Info' thing up, selected 'Shared Folder' and added the other user to the read and write permissions...it just doesn't show up on the other desktop (the folder is on my desktop, I would have expected to see it on the other desktop...?)
Okay, the article you linked to is to share a folder for access by a different Mac or PC.
That's not what you wanted to achieve. What you were after is for different users accounts within the same Mac to have access to the same folder.
Do you see the difference?