OS X Yosemite: Share files with others who use your Mac
People who use the same Mac with different user accounts can share files with one another using their Public folders and Drop Boxes. (A Drop Box is a folder inside a Public folder.)
Make an item available to all users of your Mac
Click the desktop to make sure you’re in the Finder, then choose Go > Home.
Put the item (or a copy of it) into your Public folder.
You can also put the item or copy in the Shared folder to make it available for all users of the Mac.
Files in a user’s Public folder or in the Shared folder can be read by all users of the Mac, but edited or deleted by only the owner of the file.
Share a file with another user on your Mac
Click the desktop to make sure you’re in the Finder, then choose Go > Computer.
Navigate to the person’s Drop Box:
Macintosh HD/Users/[username]/Public/Drop Box
Drag the file to the Drop Box.
Even though you can put items in another user’s Drop Box, you can’t open any Drop Box except your own.