How to Share Files on Your Mac
The simplest way to transfer files from your Mac to another computer is to share files wirelessly, or over a wired network. Files are shared on your Mac by making choices in System Preferences. So, with your networking gear in place, do the following to share some or all of the contents from one computer with another.
Choose Apple→System Preferences.
The System Preferences dialog box appears.
In the Internet & Wireless section, click Sharing.
The Sharing pane opens.
You may want to change your computer name at this point. Naming it Basement Air, for example, would help you distinguish the computer from, say, Bedroom MacBook Pro.
Select the various sharing preferences you feel comfortable with.
You might want to share files, or just your printer. If you select File Sharing, users of other machines can access any Public folders on the Mac.
If you change your mind about sharing − you may feel uneasy about having just anyone on the Net read those publicly available files − deselect the check box.
Other Mac users can access your machine by choosing Go→Network in Finder.
If you're an iCloud member who plans on taking advantage of the Back to My Mac feature, make sure to select the Screen Sharing check box.